    <SEC-DOCUMENT>0001615774-18-011677-index.html : 20181031
    <SEC-HEADER>0001615774-18-011677.hdr.sgml : 20181031
    <ACCEPTANCE-DATETIME>20181031155719
    ACCESSION NUMBER:		0001615774-18-011677
    CONFORMED SUBMISSION TYPE:	S-1/A
    PUBLIC DOCUMENT COUNT:		8
    FILED AS OF DATE:		20181031
    DATE AS OF CHANGE:		20181031

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Eton Pharmaceuticals, Inc.
    		CENTRAL INDEX KEY:			0001710340
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		IRS NUMBER:				371858472
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		S-1/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-226774
    		FILM NUMBER:		181150228

    	BUSINESS ADDRESS:
    		STREET 1:		12264 EL CAMINO REAL
    		CITY:			SAN DIEGO
    		STATE:			CA
    		ZIP:			92130
    		BUSINESS PHONE:		858-704-4040

    	MAIL ADDRESS:
    		STREET 1:		12264 EL CAMINO REAL
    		CITY:			SAN DIEGO
    		STATE:			CA
    		ZIP:			92130
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-1/A
    <SEQUENCE>1
    <FILENAME>s113558_s1a.htm
    <DESCRIPTION>S-1/A
    <TEXT>
    Document 1 - file: s113558_s1a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-1.1
    <SEQUENCE>2
    <FILENAME>s113558_ex1-1.htm
    <DESCRIPTION>EXHIBIT 1.1
    <TEXT>
    Document 2 - file: s113558_ex1-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-3.4
    <SEQUENCE>3
    <FILENAME>s113558_ex3-4.htm
    <DESCRIPTION>EXHIBIT 3.4
    <TEXT>
    Document 3 - file: s113558_ex3-4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.1
    <SEQUENCE>4
    <FILENAME>s113558_ex4-1.htm
    <DESCRIPTION>EXHIBIT 4.1
    <TEXT>
    Document 4 - file: s113558_ex4-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.4
    <SEQUENCE>5
    <FILENAME>s113558_ex4-4.htm
    <DESCRIPTION>EXHIBIT 4.4
    <TEXT>
    Document 5 - file: s113558_ex4-4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-5.1
    <SEQUENCE>6
    <FILENAME>s113558_ex5-1.htm
    <DESCRIPTION>EXHIBIT 5.1
    <TEXT>
    Document 6 - file: s113558_ex5-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.1
    <SEQUENCE>7
    <FILENAME>s113558_ex23-1.htm
    <DESCRIPTION>EXHIBIT 23.1
    <TEXT>
    Document 7 - file: s113558_ex23-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>s113558_ex4-1img01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: s113558_ex4-1img01.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>