根據Hatch-Waxman法案,當原廠藥的專利保護期限屆滿後,學名藥廠只要完成生體相等性(bioequivelence)試驗,證明主成份及生體可用率皆與原廠專利藥相同,便可依照簡明新藥申請(Abbreviated New Drug Application,ANDA)程序上市,這與一般新藥的上市查驗登記(NDA),要事先要經過一連串的臨床前試驗、動物臨床、一期至三期的人體臨床試驗等,完全不同。
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