为了改变药物吸收速度 ,所以有缓释剂型药物问世。早年的产品多将药物溶于特殊溶媒而且只供肌注或皮下注射之用 ,例如普鲁卡因青霉素 G混悬液、精蛋白锌胰岛素、胰岛素锌混悬液或油剂癸氟奋乃静等。这类剂型使有活性的药物减缓释出 ,吸收较慢 ,但与肠衣制剂不同。服用肠衣制剂 In order to change the speed of drug absorption, there are slow-release formulations available. In the early years, the products were mostly used to dissolve the drug in special vehicles and only for intramuscular or subcutaneous injection, such as procaine penicillin G suspension, zinc protamine, insulin zinc suspension or oil fenfluramine Wait. Such dosage forms slow the release of active drugs, slower absorption, but different from enteric-coated preparations. Take enteric-coated preparations