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FDA Approval Activities for this Drug… Alfentanil Injection USP, 500 mcg/mL Abbott ANDA 75-221 ALFENTANIL HYDROCHLORIDE Injection 0.5MG BASE/ML ALFENTANIL Abbott 019353 ALFENTANIL HYDROCHLORIDE Injection 0.5MG BASE/ML ALFENTA Akorn   For the latest approval information, locate this drug using this index.