    <SEC-DOCUMENT>0001297184-24-000025-index.html : 20240412
    <SEC-HEADER>0001297184-24-000025.hdr.sgml : 20240412
    <ACCEPTANCE-DATETIME>20240412162012
    ACCESSION NUMBER:		0001297184-24-000025
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240412
    DATE AS OF CHANGE:		20240412
    EFFECTIVENESS DATE:		20240412

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Amphastar Pharmaceuticals, Inc.
    		CENTRAL INDEX KEY:			0001297184
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		ORGANIZATION NAME:           	03 Life Sciences
    		IRS NUMBER:				330702205
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-36509
    		FILM NUMBER:		24841745

    	BUSINESS ADDRESS:
    		STREET 1:		11570 SIXTH STREET
    		CITY:			RANCHO CUCAMONGA
    		STATE:			CA
    		ZIP:			91730
    		BUSINESS PHONE:		909-980-9484

    	MAIL ADDRESS:
    		STREET 1:		11570 SIXTH STREET
    		CITY:			RANCHO CUCAMONGA
    		STATE:			CA
    		ZIP:			91730
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>amph-20231231xars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: amph-20231231xars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>