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给药系统(Drug Delivery System)的发展大致可分为四个阶段:第一代是一般剂型,如片剂、丸剂、胶囊剂和注射剂等;第二代是缓释制剂和前体药物;第三代是控释系统;第四代是靶向给药系统(Targeting
The development of Drug Delivery System can be divided into four stages: The first generation is a general dosage form, such as tablets, pills, capsules and injections; the second generation is a sustained release preparation and a prodrug; the first The third generation is a controlled release system; the fourth generation is a targeted delivery system (Targeting