非处方药给人们带来了很大的方便，然而，如果病人缺乏常规的医药基础知识，盲目购买使用非处方药，反而会贻误诊治或加重病情。那么，怎样科学合理地选用非处方药物呢？ 判断疾病病人购药前，应根据症状，结合自己掌握的医药知识，作出明确的判断，也可向销售药品的业务人员进 Over-the-counter medicines have brought great convenience to people. However, if patients lack the routine medical knowledge and blindly buy over-the-counter medicines, they will actually delaying the diagnosis and treatment or aggravating the disease. So, how scientific and rational use of non-prescription drugs? To determine the disease before the purchase of drugs, should be based on the symptoms, combined with their own grasp of medical knowledge, make a clear judgment, but also to sales of pharmaceutical business staff into