 RANCHO CUCAMONGA, CA ACCESSWIRE May 2, 2022 Amphastar Pharmaceuticals, Inc. NASDAQ:AMPH announced that the Company will release results for its first quarter of 2022 ended March 31, 2022, after the market closes on Monday, May 9th 2022, and will hold a conference call to discuss its financial results at 2:00 p.m. Pacific Time. 