在目前我国医药工业还不能完全满足医疗单位临床需求的情况下,医院还必须自制一些临床所需求的普通制剂,这部分制剂具有用量少,品种多的特点。这就给配制带来了困难,少量配制会给制剂单位造成人力、物力、财力的浪费,带来不必要的经济损失;大量配制又担心使用时间过长,制剂质量发生变化,影响药效,甚至给病人带来不应有的恶果。因而一个普通制剂使用期限的问题值得关注。近年来, At present, China’s pharmaceutical industry can not fully meet the clinical needs of medical units, the hospital must also make some of the general needs of clinical preparations, this part of the preparation with less dosage, variety and more features. This will bring difficulties to the formulation. A small amount of preparation will cause unnecessary waste of human, material and financial resources to the preparation unit, causing unnecessary economic loss. For a long time, the preparation and the quality will change, Even to patients with undesirable consequences. Thus the issue of the useful life of an ordinary preparation deserves attention. In recent years,