应用药物治疗疾病,有时单用一味药即可,但在多数情况下,常同时应用两种或多种药物,主要是为了加强疗效,如治疗充血性心力衰竭常合并应用强心甙和利尿剂;治疗心绞痛可合并应用心得安和亚硝酸类。有时,合并用药是为了减少不良反应,如排钾利尿剂与保钾利尿剂的合用。近年来,用于临床的有效药物不断增加,同时应用两种以上药物的机会很多。由于药物的相互作用,也常会带来一些不良反应。有人报导,应用的药物愈多,不良反应的发生率也愈高。因此,如果只了解个别药物的作用而不掌握药物之间的相互作用,很可能由于合并用药不当引起许多不良反应。药物相互作用非常复杂,目前总结出来的一些规律 The application of drugs for the treatment of diseases, sometimes only blindly medicine can be, but in most cases, often two or more drugs at the same time, mainly to enhance the efficacy, such as the treatment of congestive heart failure often combined with cardiac glycosides and diuretics ; Treatment of angina pectoris can be combined with the application of nitrite and nitrite. Sometimes, the combination of medication is to reduce adverse reactions, such as potassium row diuretics and potassium-sparing diuretic combination. In recent years there has been a steady increase in effective medicines for clinical use, and there are many opportunities to apply two or more medications at the same time. Due to drug interactions, it also often brings some adverse reactions. It was reported that the more drugs used, the higher the incidence of adverse reactions. Therefore, knowing only the effects of individual medications without mastery of the drug interactions is likely to cause many adverse effects due to improper medications. Drug interactions are complex and some of the laws that are currently being summarized