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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NPBgvvUBtyJwlOZNCjqNNMRWViVuujEoucFU9Zz9NYHQF2e8YQaXwhkvBesCbbC5
 8PkqZek4SjFA6C52t2zTJQ==

<SEC-DOCUMENT>0001005477-03-004240.txt : 20031029
<SEC-HEADER>0001005477-03-004240.hdr.sgml : 20031029
<ACCEPTANCE-DATETIME>20031029144642
ACCESSION NUMBER:		0001005477-03-004240
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031029
FILED AS OF DATE:		20031029

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MYOGEN INC
		CENTRAL INDEX KEY:			0001101052
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				841348020
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		7575 WEST 103RD AVENUE STE 102
		CITY:			WESTMINSTER
		STATE:			CO
		ZIP:			80021
		BUSINESS PHONE:		3034106666

	MAIL ADDRESS:	
		STREET 1:		7575 WEST 103RD AVENUE STE 102
		CITY:			WESTMINSTER
		STATE:			CO
		ZIP:			80021

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			J P MORGAN CHASE & CO
		CENTRAL INDEX KEY:			0000019617
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50438
		FILM NUMBER:		03963327

	BUSINESS ADDRESS:	
		STREET 1:		270 PARK AVE
		STREET 2:		39TH FL
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		2122706000

	MAIL ADDRESS:	
		STREET 1:		270 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHASE MANHATTAN CORP /DE/
		DATE OF NAME CHANGE:	19960402

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHEMICAL BANKING CORP
		DATE OF NAME CHANGE:	19920703

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHEMICAL NEW YORK CORP
		DATE OF NAME CHANGE:	19880508
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar123.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>
    <periodOfReport>2003-10-29</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001101052</issuerCik>
        <issuerName>MYOGEN INC</issuerName>
        <issuerTradingSymbol>MYOG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000019617</rptOwnerCik>
            <rptOwnerName>J P MORGAN CHASE &amp; CO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>270 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
        <isDirector>0</isDirector>
        <isOfficer>0</isOfficer>
        <isTenPercentOwner>1</isTenPercentOwner>
        <isOther>0</isOther>
    </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>

        <securityTitle>
            <value>Series D Preferred Stock</value>
        </securityTitle>

        <conversionOrExercisePrice>
            <footnoteId id="F1"/>
        </conversionOrExercisePrice>

        <exerciseDate>
            <footnoteId id="F1"/>
        </exerciseDate>

        <expirationDate>
            <footnoteId id="F2"/>
        </expirationDate>
        <underlyingSecurity>

            <underlyingSecurityTitle>
                <value>Common Stock</value>
            </underlyingSecurityTitle>

            <underlyingSecurityShares>
                <value>21039243</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <ownershipNature>

            <directOrIndirectOwnership>
                <value>I</value>
            </directOrIndirectOwnership>

            <natureOfOwnership>
                <value>See Footnote</value>
                <footnoteId id="F3"/>
            </natureOfOwnership>
        </ownershipNature>
        </derivativeHolding>

    </derivativeTable>
    <footnotes>
        <footnote id="F1">The number of shares does not reflect the automatic conversion of Series D Preferred Stock into 0.2 shares of Common Stock upon the closing of the initial public offering of the Issuer; upon such closing, the Reporting Person will beneficially own 4,207,847 shares of Common Stock.</footnote>
        <footnote id="F2">The Series D Preferred Stock has no expiration date.</footnote>
        <footnote id="F3">The amounts shown represent the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners (SBIC), LLC ("JPM SBIC") and J.P. Morgan Securities Inc. ("JPMSI"), a portion of which may be deemed attributable to the Reporting Person because it is the sole stockholder of JPMP Capital Corp. (the general partner of JPMP Master Fund Manager, L.P. ("MF Manager"), the sole general partner of J.P. Morgan Partners (BHCA), L.P., which is the sole member of JPM SBIC) and the controlling parent of J.P. Morgan Securities Inc.  The actual pro rata portion of such beneficial ownership that may be deemed attributable to the Reporting Person is not readily determinable because it is subject to several variables including the internal rate of return and vesting of interests within MF Manager.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Jeffrey C. Walker</signatureName>
        <signatureDate>2003-10-29</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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