Penicillins and semi-synthetic derivatives sharing the penicillanic acid core — including amoxicillin, ampicillin, and their pharmaceutical salts — are regulated as active pharmaceutical ingredients subject to FDA's drug import program, requiring manufacture at an FDA-registered foreign facility that has passed inspection. These beta-lactam antibiotics are among the most widely prescribed antibiotic classes globally, and bulk API supply is heavily concentrated in a small number of manufacturing countries, creating ongoing supply-chain resilience concerns for US pharmaceutical manufacturers. Importers must ensure that each shipment is accompanied by a certificate of analysis meeting USP or equivalent pharmacopeial specifications, and that the foreign manufacturer appears on FDA's approved drug establishment list. Classification accuracy is important because penicillin derivatives may also be subject to Section 301 tariff measures depending on origin.

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