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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeited/Cancelled (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0EF0E6E5AE14F83293571CC73E5D9325" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_A163594508A70934D7E11CC73E5DD003_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_A163594508A70934D7E11CC73E5DD003" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_A163594508A70934D7E11CC73E5DD003" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_686D20EFB7C4D6428BA81CC73E63AD00" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_75FB39F38907C07237461CC73E639930_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_75FB39F38907C07237461CC73E639930" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable at the end of the period (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_75FB39F38907C07237461CC73E639930_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_75FB39F38907C07237461CC73E639930" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_75FB39F38907C07237461CC73E639930" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_E2E49FA94D2D42D6A2151CC73E6324A0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_E2E49FA94D2D42D6A2151CC73E6324A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted- average remaining contractual term</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_E2E49FA94D2D42D6A2151CC73E6324A0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_E2E49FA94D2D42D6A2151CC73E6324A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]</link:label>
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_04337201930DA25756491CC73E632F4C_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_04337201930DA25756491CC73E632F4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_04337201930DA25756491CC73E632F4C_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_04337201930DA25756491CC73E632F4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_04337201930DA25756491CC73E632F4C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_33F639C5E50F59EBF6B41CC73E630314" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable at the end of the period</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_3F939F2B5295A08C263A1CC73E644CFB" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_9CF88744FD9E538A576A1CC73E647024_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_9CF88744FD9E538A576A1CC73E647024" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate intrinsic value (in thousands)</link:label>
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    <link:loc xlink:href="ptct-20190930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_9CF88744FD9E538A576A1CC73E647024" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_9CF88744FD9E538A576A1CC73E647024" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_9CF88744FD9E538A576A1CC73E647024" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_714FED1CB579579CE3AA1CC73E6426AD_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_714FED1CB579579CE3AA1CC73E6426AD" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period (in dollars)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_714FED1CB579579CE3AA1CC73E6426AD_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_714FED1CB579579CE3AA1CC73E6426AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_714FED1CB579579CE3AA1CC73E6426AD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_6A6A3214A49392FC3A5B1CC73E646FCB_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_6A6A3214A49392FC3A5B1CC73E646FCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period (in dollars)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_6A6A3214A49392FC3A5B1CC73E646FCB_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_6A6A3214A49392FC3A5B1CC73E646FCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value</link:label>
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    <link:label id="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_0BB8A113A395D52823576336DC69D53F_documentation_en-US" xlink:label="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_65C5ED6F147C5B75ACDDC871A7D91A65" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the 2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member" xlink:label="loc_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_65C5ED6F147C5B75ACDDC871A7D91A65" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_65C5ED6F147C5B75ACDDC871A7D91A65" xlink:to="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_65C5ED6F147C5B75ACDDC871A7D91A65" xlink:type="arc" />
    <link:label id="lab_ptct_LongTermIncentivePlan2013Member_C63361F89D158B4E23806336DC69B852_terseLabel_en-US" xlink:label="lab_ptct_LongTermIncentivePlan2013Member_A93D92C4C7F85F7E90DFFAC56DD961E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013 Long Term Incentive Plan</link:label>
    <link:label id="lab_ptct_LongTermIncentivePlan2013Member_C63361F89D158B4E23806336DC69B852_label_en-US" xlink:label="lab_ptct_LongTermIncentivePlan2013Member_A93D92C4C7F85F7E90DFFAC56DD961E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long Term Incentive Plan2013 [Member]</link:label>
    <link:label id="lab_ptct_LongTermIncentivePlan2013Member_C63361F89D158B4E23806336DC69B852_documentation_en-US" xlink:label="lab_ptct_LongTermIncentivePlan2013Member_A93D92C4C7F85F7E90DFFAC56DD961E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the 2013 Long Term Incentive Plan.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_LongTermIncentivePlan2013Member" xlink:label="loc_ptct_LongTermIncentivePlan2013Member_A93D92C4C7F85F7E90DFFAC56DD961E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_LongTermIncentivePlan2013Member_A93D92C4C7F85F7E90DFFAC56DD961E2" xlink:to="lab_ptct_LongTermIncentivePlan2013Member_A93D92C4C7F85F7E90DFFAC56DD961E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedStockMember_0B7B8905554F308546CB6336DC6A863C_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_95DADB315F7E5376AB936ABBCD10BE30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unvested restricted stock</link:label>
    <link:label id="lab_us-gaap_RestrictedStockMember_0B7B8905554F308546CB6336DC6A863C_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_95DADB315F7E5376AB936ABBCD10BE30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_95DADB315F7E5376AB936ABBCD10BE30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockMember_95DADB315F7E5376AB936ABBCD10BE30" xlink:to="lab_us-gaap_RestrictedStockMember_95DADB315F7E5376AB936ABBCD10BE30" xlink:type="arc" />
    <link:label id="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_B91ABB8941E0457AEEA86336DC6B8C79_terseLabel_en-US" xlink:label="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_5432193C2499591288E3E03AE1838C9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1998 Employee, Director and Consultant Stock Option Plan</link:label>
    <link:label id="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_B91ABB8941E0457AEEA86336DC6B8C79_label_en-US" xlink:label="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_5432193C2499591288E3E03AE1838C9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Director And Consultant Stock Option Plan [Member]</link:label>
    <link:label id="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_B91ABB8941E0457AEEA86336DC6B8C79_documentation_en-US" xlink:label="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_5432193C2499591288E3E03AE1838C9C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the 1998 Employee, Director and Consultant Stock Option Plan</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_EmployeeDirectorAndConsultantStockOptionPlanMember" xlink:label="loc_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_5432193C2499591288E3E03AE1838C9C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_5432193C2499591288E3E03AE1838C9C" xlink:to="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_5432193C2499591288E3E03AE1838C9C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ED336E8837EEA67F18326336DC6DDC65_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_20002DC9AA075702BE06C410F4D4FC57" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares authorized (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ED336E8837EEA67F18326336DC6DDC65_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_20002DC9AA075702BE06C410F4D4FC57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_20002DC9AA075702BE06C410F4D4FC57" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_20002DC9AA075702BE06C410F4D4FC57" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_20002DC9AA075702BE06C410F4D4FC57" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_67644C02907DA241FD0B6336DC6D01CD_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_EC5FEA4EFFFA5C4E879F4D12A7F6E8AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Grants in period (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_67644C02907DA241FD0B6336DC6D01CD_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_EC5FEA4EFFFA5C4E879F4D12A7F6E8AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_EC5FEA4EFFFA5C4E879F4D12A7F6E8AD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_EC5FEA4EFFFA5C4E879F4D12A7F6E8AD" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_EC5FEA4EFFFA5C4E879F4D12A7F6E8AD" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_D872E7051B45424ECD966336DC6DE2AA_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_80D623564A575081AC61BB5FE88DD8A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares available for issuance (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_D872E7051B45424ECD966336DC6DE2AA_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_80D623564A575081AC61BB5FE88DD8A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_80D623564A575081AC61BB5FE88DD8A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_80D623564A575081AC61BB5FE88DD8A7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_80D623564A575081AC61BB5FE88DD8A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_92600173F3B5A89BCA196336DC6DB562_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_33491059A3015ECBB578AB1F4A32EE31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of additional shares authorized (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_92600173F3B5A89BCA196336DC6DB562_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_33491059A3015ECBB578AB1F4A32EE31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_33491059A3015ECBB578AB1F4A32EE31" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_33491059A3015ECBB578AB1F4A32EE31" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_33491059A3015ECBB578AB1F4A32EE31" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_6CFE3394223B748C90D96336DC6D50BB_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_4D7D161A162E5A2480A2245D4B2E0223" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares subject to outstanding awards (in shares)</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_6CFE3394223B748C90D96336DC6D50BB_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_4D7D161A162E5A2480A2245D4B2E0223" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Shares Subject to Outstanding Awards</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_6CFE3394223B748C90D96336DC6D50BB_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_4D7D161A162E5A2480A2245D4B2E0223" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of shares subject to outstanding awards used to calculate authorized shares.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_4D7D161A162E5A2480A2245D4B2E0223" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_4D7D161A162E5A2480A2245D4B2E0223" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_4D7D161A162E5A2480A2245D4B2E0223" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_91449ABA4BC65E1235C66336DC6E6423_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_7A640DB6C09459F29F97089A547D0DDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual increase in the number of shares (in shares) on the first day of the fiscal year</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_91449ABA4BC65E1235C66336DC6E6423_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_7A640DB6C09459F29F97089A547D0DDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase Number</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_91449ABA4BC65E1235C66336DC6E6423_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_7A640DB6C09459F29F97089A547D0DDA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of shares to be added annually on the first day of each fiscal year in the number of shares authorized.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_7A640DB6C09459F29F97089A547D0DDA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_7A640DB6C09459F29F97089A547D0DDA" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_7A640DB6C09459F29F97089A547D0DDA" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_6C982189A0234C929A2A6336DC6E9479_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_A7E7ABDDA19759C99030881C794D29EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual increase in the number of shares outstanding on the first day of the fiscal year</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_6C982189A0234C929A2A6336DC6E9479_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_A7E7ABDDA19759C99030881C794D29EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase as Percentage of Stock Outstanding</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_6C982189A0234C929A2A6336DC6E9479_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_A7E7ABDDA19759C99030881C794D29EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of shares outstanding to be added annually on the first day of each fiscal year in the number of shares authorized.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_A7E7ABDDA19759C99030881C794D29EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_A7E7ABDDA19759C99030881C794D29EB" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_A7E7ABDDA19759C99030881C794D29EB" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_1921F17959FFFCDA04526336DC6EEE97_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_C4D1831F8CE159919E885526D3620C9D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inducement grants for non-statutory stock options (in shares)</link:label>
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    <link:label id="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_C33E082C3F04E1696F4014EEBD8F7933_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_C33E082C3F04E1696F4014EEBD8F7933" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redemption on or after August 20, 2018</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_899DD4E44451EEC9373C14EEBD8F83BD_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_899DD4E44451EEC9373C14EEBD8F83BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, maximum borrowing capacity</link:label>
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    <link:label id="lab_ptct_LineOfCreditFacilityAdditionalCapacityAvailable_EFC3528937FEA35054D614EEBD9045AB_terseLabel_en-US" xlink:label="lab_ptct_LineOfCreditFacilityAdditionalCapacityAvailable_EFC3528937FEA35054D614EEBD9045AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, additional capacity available, net product revenue threshold</link:label>
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    <link:label id="lab_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, interest payment period</link:label>
    <link:label id="lab_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80_label_en-US" xlink:label="lab_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Payment Period</link:label>
    <link:label id="lab_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Payment Period</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_DebtInstrumentInterestPaymentPeriod" xlink:label="loc_ptct_DebtInstrumentInterestPaymentPeriod_F9A5B55EC725DB0C21FC14EEBD910F80" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_C4FFF1FD15F1E8E1BD7114EEBD91F57F_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_C4FFF1FD15F1E8E1BD7114EEBD91F57F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt principal amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_C4FFF1FD15F1E8E1BD7114EEBD91F57F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_C4FFF1FD15F1E8E1BD7114EEBD91F57F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_C4FFF1FD15F1E8E1BD7114EEBD91F57F" xlink:type="locator" />
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    <link:label id="lab_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument Additional Amount Available For Repurchase</link:label>
    <link:label id="lab_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929_label_en-US" xlink:label="lab_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Additional Amount Available For Repurchase</link:label>
    <link:label id="lab_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument Additional Amount Available For Repurchase</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase" xlink:label="loc_ptct_DebtInstrumentAdditionalAmountAvailableForRepurchase_94D5D29DE583ED739FF614EEBD91A929" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D0ECD994AF7EE7A7011714EEBD91659E_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D0ECD994AF7EE7A7011714EEBD91659E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate ( as a percent )</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D0ECD994AF7EE7A7011714EEBD91659E_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D0ECD994AF7EE7A7011714EEBD91659E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_D0ECD994AF7EE7A7011714EEBD91659E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_73F083C6C324E5CAD20214EEBD919DAF_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_73F083C6C324E5CAD20214EEBD919DAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net proceeds from issuance of convertible notes</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_73F083C6C324E5CAD20214EEBD919DAF_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_73F083C6C324E5CAD20214EEBD919DAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Debt, Net of Issuance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_73F083C6C324E5CAD20214EEBD919DAF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_8B61D2D175E186F40BFC14EEBD9144C2_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_8B61D2D175E186F40BFC14EEBD9144C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading days, number</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_8B61D2D175E186F40BFC14EEBD9144C2_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_8B61D2D175E186F40BFC14EEBD9144C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Trading Days</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_8B61D2D175E186F40BFC14EEBD9144C2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_28CEECC9351BDCDF5C6614EEBD9207DD_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_28CEECC9351BDCDF5C6614EEBD9207DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consecutive trading days, period</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_28CEECC9351BDCDF5C6614EEBD9207DD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_366D349BF8AC450DC7DA14EEBD92FA54_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_366D349BF8AC450DC7DA14EEBD92FA54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock price trigger</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_366D349BF8AC450DC7DA14EEBD92FA54_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_366D349BF8AC450DC7DA14EEBD92FA54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_366D349BF8AC450DC7DA14EEBD92FA54" xlink:type="locator" />
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    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business days, period</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A_label_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Convertible Threshold Business Days</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Threshold period of specified business days within which the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day triggers the conversion feature.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_DebtInstrumentConvertibleThresholdBusinessDays" xlink:label="loc_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A" xlink:to="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_107998BDEB178D0E552A14EEBD92259A" xlink:type="arc" />
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consecutive trading-day period</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC_label_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Convertible Threshold Consecutive Trading Day Period</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Threshold period of specified consecutive trading days within which the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day triggers the conversion feature.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod" xlink:label="loc_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_FE974126340055C79D3D14EEBD927CCC" xlink:type="locator" />
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    <link:label id="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_5B3D0042A6CD86D287F014EEBD9292C2_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_5B3D0042A6CD86D287F014EEBD9292C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock per principal amount</link:label>
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    <link:label id="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_5B3D0042A6CD86D287F014EEBD9292C2_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_5B3D0042A6CD86D287F014EEBD9292C2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the denomination of the principal amount of debt that is used in conversion calculations.</link:label>
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    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228_label_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Convertible Threshold Sale Price Of Common Stock Conversion Rate Product Percentage Maximum</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum" xlink:label="loc_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_250BD151381E9E549FF514EEBD926228" xlink:type="locator" />
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    <link:label id="lab_us-gaap_MovementInDeferredRevenueRollForward_9EEC5328CDE23E2CD2C06336DBD169FF_terseLabel_en-US" xlink:label="lab_us-gaap_MovementInDeferredRevenueRollForward_4C57FEAEF563562080854A6C13F29C76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Movement in Deferred Revenue [Roll Forward]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MovementInDeferredRevenueRollForward" xlink:label="loc_us-gaap_MovementInDeferredRevenueRollForward_4C57FEAEF563562080854A6C13F29C76" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ContractWithCustomerLiability_8AE1EA613FFFB83E4B2E6336DBD110D6_periodStartLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_ED10687B6D2655BFB27832173DB929ED" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning balance</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_ED10687B6D2655BFB27832173DB929ED" xlink:to="lab_us-gaap_ContractWithCustomerLiability_ED10687B6D2655BFB27832173DB929ED" xlink:type="arc" />
    <link:label id="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_BF8FC811637F0EB6E86A6336DBD1925B_terseLabel_en-US" xlink:label="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_CC5C6102DBD353DC812463997E8B1DA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions</link:label>
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    <link:label id="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_BF8FC811637F0EB6E86A6336DBD1925B_documentation_en-US" xlink:label="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_CC5C6102DBD353DC812463997E8B1DA4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract with Customer, Liability, Increase from Cash Receipts</link:label>
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    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized_1B99A2BBA145B2D241386336DBD2D55E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized_EF8117FF0608594C843EAA41E181650C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Deductions</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized_EF8117FF0608594C843EAA41E181650C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized_EF8117FF0608594C843EAA41E181650C" xlink:to="lab_us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized_EF8117FF0608594C843EAA41E181650C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_20FE40580B70EF43F23A6336DBD28348_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_854E5506A8F456CDAE310FFAA5E95372" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ASC 606 Adjustment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_854E5506A8F456CDAE310FFAA5E95372" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_B84EEECE8D5B51C7AFAC18E345B7D633" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_B84EEECE8D5B51C7AFAC18E345B7D633" xlink:to="lab_us-gaap_ContractWithCustomerLiability_B84EEECE8D5B51C7AFAC18E345B7D633" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryRawMaterials_3C6BAE11D95EBA094D9D6336DD17A8CB_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryRawMaterials_B6F8593696AE590D9AD068E765A85C3C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Raw materials</link:label>
    <link:label id="lab_us-gaap_InventoryRawMaterials_3C6BAE11D95EBA094D9D6336DD17A8CB_label_en-US" xlink:label="lab_us-gaap_InventoryRawMaterials_B6F8593696AE590D9AD068E765A85C3C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Raw Materials, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryRawMaterials" xlink:label="loc_us-gaap_InventoryRawMaterials_B6F8593696AE590D9AD068E765A85C3C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryWorkInProcess_709F0FD1E7AB56FF5D2B6336DD18BCED_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryWorkInProcess_337F8D706F3E5665A388C3C2A4859696" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Work in progress</link:label>
    <link:label id="lab_us-gaap_InventoryWorkInProcess_709F0FD1E7AB56FF5D2B6336DD18BCED_label_en-US" xlink:label="lab_us-gaap_InventoryWorkInProcess_337F8D706F3E5665A388C3C2A4859696" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Work in Process, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaap_InventoryWorkInProcess_337F8D706F3E5665A388C3C2A4859696" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryFinishedGoods_7D3A05395C59A313C4476336DD185D03_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoods_1DCF2D6E95A2539C83CF6A8D21A9B932" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finished goods</link:label>
    <link:label id="lab_us-gaap_InventoryFinishedGoods_7D3A05395C59A313C4476336DD185D03_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoods_1DCF2D6E95A2539C83CF6A8D21A9B932" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Finished Goods, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_1DCF2D6E95A2539C83CF6A8D21A9B932" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryNet_D2C10C90D2229D4CE3DA6336DD187CB1_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_C85902189E145B8FA7AC63DEDC4F6A88" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total inventory</link:label>
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    <link:label id="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_EF53728C401CF74D311F6336DBE75514_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_E845928D181E51A3975364F3E905DFE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract liabilities, rollforward and revenue recognition</link:label>
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    <link:label id="lab_ptct_NumberOfProducts_FAA35E74E16BE7BA13C1F44D74A7A8F6_terseLabel_en-US" xlink:label="lab_ptct_NumberOfProducts_FAA35E74E16BE7BA13C1F44D74A7A8F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of products</link:label>
    <link:label id="lab_ptct_NumberOfProducts_FAA35E74E16BE7BA13C1F44D74A7A8F6_label_en-US" xlink:label="lab_ptct_NumberOfProducts_FAA35E74E16BE7BA13C1F44D74A7A8F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Products</link:label>
    <link:label id="lab_ptct_NumberOfProducts_FAA35E74E16BE7BA13C1F44D74A7A8F6_documentation_en-US" xlink:label="lab_ptct_NumberOfProducts_FAA35E74E16BE7BA13C1F44D74A7A8F6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Products</link:label>
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    <link:label id="lab_ptct_NumberOfStatesInEuropeanEconomicArea_4D3B073CA040AAB8015AF44D74A86FFB_terseLabel_en-US" xlink:label="lab_ptct_NumberOfStatesInEuropeanEconomicArea_4D3B073CA040AAB8015AF44D74A86FFB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of member states of the European Economic Area</link:label>
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    <link:label id="lab_ptct_NumberOfStatesInEuropeanEconomicArea_4D3B073CA040AAB8015AF44D74A86FFB_documentation_en-US" xlink:label="lab_ptct_NumberOfStatesInEuropeanEconomicArea_4D3B073CA040AAB8015AF44D74A86FFB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of states in European economic area.</link:label>
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    <link:label id="lab_ptct_NumberOfCountries_A372B42E8894322A5516F44D74A8AC87_terseLabel_en-US" xlink:label="lab_ptct_NumberOfCountries_A372B42E8894322A5516F44D74A8AC87" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of countries ( over )</link:label>
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    <link:label id="lab_ptct_NumberOfCountries_A372B42E8894322A5516F44D74A8AC87_documentation_en-US" xlink:label="lab_ptct_NumberOfCountries_A372B42E8894322A5516F44D74A8AC87" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents number of countries.</link:label>
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    <link:label id="lab_ptct_RocheAndSmaFoundationMember_5EC1CEEF7B47494BC3C56336DBDD0B2D_documentation_en-US" xlink:label="lab_ptct_RocheAndSmaFoundationMember_D562D6FAC8BE555795C916A33F31E3EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Roche and SMA Foundation</link:label>
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    <link:label id="lab_ptct_MilestoneDomain_387B849595EB94476ADE6336DBDFC4A2_terseLabel_en-US" xlink:label="lab_ptct_MilestoneDomain_BB85D7638CE855278096BB1B022717CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Milestone [Domain]</link:label>
    <link:label id="lab_ptct_MilestoneDomain_387B849595EB94476ADE6336DBDFC4A2_label_en-US" xlink:label="lab_ptct_MilestoneDomain_BB85D7638CE855278096BB1B022717CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Milestone [Domain]</link:label>
    <link:label id="lab_ptct_MilestoneDomain_387B849595EB94476ADE6336DBDFC4A2_documentation_en-US" xlink:label="lab_ptct_MilestoneDomain_BB85D7638CE855278096BB1B022717CE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Different categories of milestones defined by agreements.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_MilestoneDomain" xlink:label="loc_ptct_MilestoneDomain_BB85D7638CE855278096BB1B022717CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_MilestoneDomain_BB85D7638CE855278096BB1B022717CE" xlink:to="lab_ptct_MilestoneDomain_BB85D7638CE855278096BB1B022717CE" xlink:type="arc" />
    <link:label id="lab_ptct_ResearchAndDevelopmentEventMilestonesMember_AEE37150DEE17BD417486336DBE09C1A_terseLabel_en-US" xlink:label="lab_ptct_ResearchAndDevelopmentEventMilestonesMember_CF5D696A04295887A0FD4FD8DAFD3781" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research And Development Event Milestones</link:label>
    <link:label id="lab_ptct_ResearchAndDevelopmentEventMilestonesMember_AEE37150DEE17BD417486336DBE09C1A_label_en-US" xlink:label="lab_ptct_ResearchAndDevelopmentEventMilestonesMember_CF5D696A04295887A0FD4FD8DAFD3781" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research And Development Event Milestones [Member]</link:label>
    <link:label id="lab_ptct_ResearchAndDevelopmentEventMilestonesMember_AEE37150DEE17BD417486336DBE09C1A_documentation_en-US" xlink:label="lab_ptct_ResearchAndDevelopmentEventMilestonesMember_CF5D696A04295887A0FD4FD8DAFD3781" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to certain research and development events on the basis of which certain milestones are achieved.</link:label>
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    <link:label id="lab_us-gaap_NumberOfOperatingSegments_7C594D98937275840ECF6336DBE1B408_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_EA85AF365931551DB23A7BA94AE9152D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of operating segments</link:label>
    <link:label id="lab_us-gaap_NumberOfOperatingSegments_7C594D98937275840ECF6336DBE1B408_label_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_EA85AF365931551DB23A7BA94AE9152D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Operating Segments</link:label>
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    <link:label id="lab_ptct_NetProductSales_5B2DF848BF2A727846886336DBE1B545_terseLabel_en-US" xlink:label="lab_ptct_NetProductSales_3037FE0BF4EF50D6BF69D67718B15266" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net product revenue</link:label>
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    <link:label id="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_B6687B7888B7D95C3B9A6336DBE1ADF4_verboseLabel_en-US" xlink:label="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_66A9EC6A12EC50E1BAAADC43F428E0C9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Upfront cash payment</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts" xlink:label="loc_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_66A9EC6A12EC50E1BAAADC43F428E0C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_66A9EC6A12EC50E1BAAADC43F428E0C9" xlink:to="lab_ptct_ContractWithCustomerLiabilityIncreaseFromCashReceipts_66A9EC6A12EC50E1BAAADC43F428E0C9" xlink:type="arc" />
    <link:label id="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_4ACFDA02B422EC0042186336DBE133C1_terseLabel_en-US" xlink:label="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_8EB6D81E86D458BD9CCCFDF40E3F3D00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of compounds in preclinical development</link:label>
    <link:label id="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_4ACFDA02B422EC0042186336DBE133C1_label_en-US" xlink:label="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_8EB6D81E86D458BD9CCCFDF40E3F3D00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangements Number of Compounds in Preclinical Development</link:label>
    <link:label id="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_4ACFDA02B422EC0042186336DBE133C1_documentation_en-US" xlink:label="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_8EB6D81E86D458BD9CCCFDF40E3F3D00" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of compounds included in preclinical development.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment" xlink:label="loc_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_8EB6D81E86D458BD9CCCFDF40E3F3D00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_8EB6D81E86D458BD9CCCFDF40E3F3D00" xlink:to="lab_ptct_CollaborativeArrangementsNumberOfCompoundsInPreclinicalDevelopment_8EB6D81E86D458BD9CCCFDF40E3F3D00" xlink:type="arc" />
    <link:label id="lab_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_614A7648F59C1C6780A16336DBE19410_terseLabel_en-US" xlink:label="lab_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_E9508C9E25055125A6571D82EFF032C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of significant deliverables</link:label>
    <link:label id="lab_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_614A7648F59C1C6780A16336DBE19410_label_en-US" xlink:label="lab_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_E9508C9E25055125A6571D82EFF032C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangements Number of Significant Deliverables</link:label>
    <link:label id="lab_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_614A7648F59C1C6780A16336DBE19410_documentation_en-US" xlink:label="lab_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_E9508C9E25055125A6571D82EFF032C5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of significant deliverables under a contractual agreement.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_CollaborativeArrangementsNumberOfSignificantDeliverables" xlink:label="loc_ptct_CollaborativeArrangementsNumberOfSignificantDeliverables_E9508C9E25055125A6571D82EFF032C5" xlink:type="locator" />
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    <link:label id="lab_ptct_RevenueRecognitionMilestonePotentialAchievements_53BB38F90CB2058DEEDE6336DBE15B7A_terseLabel_en-US" xlink:label="lab_ptct_RevenueRecognitionMilestonePotentialAchievements_2E1270D7A58A5A1AB4BCAA863C49387D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue recognition, milestone, potential achievements</link:label>
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    <link:label id="lab_ptct_RevenueRecognitionMilestonePotentialAchievements_53BB38F90CB2058DEEDE6336DBE15B7A_documentation_en-US" xlink:label="lab_ptct_RevenueRecognitionMilestonePotentialAchievements_2E1270D7A58A5A1AB4BCAA863C49387D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Milestone, Potential Achievements</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_RevenueRecognitionMilestonePotentialAchievements" xlink:label="loc_ptct_RevenueRecognitionMilestonePotentialAchievements_2E1270D7A58A5A1AB4BCAA863C49387D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Revenues_606E1F327154B7ACA3E26336DBE2114D_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_1B96F55440E35BECB7ECF658EA21A077" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:label id="lab_us-gaap_Revenues_606E1F327154B7ACA3E26336DBE2114D_label_en-US" xlink:label="lab_us-gaap_Revenues_1B96F55440E35BECB7ECF658EA21A077" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_1B96F55440E35BECB7ECF658EA21A077" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_1B96F55440E35BECB7ECF658EA21A077" xlink:to="lab_us-gaap_Revenues_1B96F55440E35BECB7ECF658EA21A077" xlink:type="arc" />
    <link:label id="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_682E5E4545D00D9C69AE6336DBE29EFD_terseLabel_en-US" xlink:label="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_AE537348C6605AFB92660E486C387D5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaborative arrangements research period for applying discovery technology</link:label>
    <link:label id="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_682E5E4545D00D9C69AE6336DBE29EFD_label_en-US" xlink:label="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_AE537348C6605AFB92660E486C387D5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangements Research Period for Applying Discovery Technology</link:label>
    <link:label id="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_682E5E4545D00D9C69AE6336DBE29EFD_documentation_en-US" xlink:label="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_AE537348C6605AFB92660E486C387D5A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the research period for applying discovery technology.</link:label>
    <link:loc xlink:href="ptct-20190930.xsd#ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology" xlink:label="loc_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_AE537348C6605AFB92660E486C387D5A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_AE537348C6605AFB92660E486C387D5A" xlink:to="lab_ptct_CollaborativeArrangementsResearchPeriodForApplyingDiscoveryTechnology_AE537348C6605AFB92660E486C387D5A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_EF90EE4988F865C061966336DC7B2BDC_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_483CAB4F9B715C8BB9F1D8A3E9CBC91F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_EF90EE4988F865C061966336DC7B2BDC_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_483CAB4F9B715C8BB9F1D8A3E9CBC91F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
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    <link:label id="lab_us-gaap_EmployeeStockOptionMember_AFE94FBCE3333BCBFE5F6336DC7C4CBA_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_F0FCFC92F4FF5910B0A5BF723AF8C5E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Options</link:label>
    <link:label id="lab_us-gaap_EmployeeStockOptionMember_AFE94FBCE3333BCBFE5F6336DC7C4CBA_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_F0FCFC92F4FF5910B0A5BF723AF8C5E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Option [Member]</link:label>
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