Amphastar Pharmaceuticals, Inc. revenue for the last year amounted to 644.39 M USD, the most of which — 630.27 M USD — came from its highest performing source at the moment, Finished Pharmaceutical Products, the year earlier bringing 486.50 M USD. The greatest contribution to the revenue figure was made by United States — last year it brought Amphastar Pharmaceuticals, Inc. 635.19 M USD, and the year before that — 486.83 M USD.