Amphastar Pharmaceuticals is a biopharmaceutical company that manufactures and commercializes technically challenging generic and proprietary injectable, inhalation, and intranasal products, along with active pharmaceutical ingredients. The company operates over 25 prescription drugs and one OTC product (Primatene MIST®) targeting high-barrier-to-entry markets in injectables and inhalation therapeuties, leveraging specialized capabilities in complex molecule characterization, peptide synthesis, and advanced formulation development. Revenue is generated through sales to hospitals, long-term care facilities, clinics, and retail pharmacies via specialty distributors and wholesalers, with products distributed by major customers including McKesson, Cencora, and Cardinal Health, while the company maintains vertical integration across manufacturing facilities in North America, Europe, and Asia to control the supply chain and strengthen competitive positioning in these specialized markets.