为了保证用药安全和有效,医生处方时必需认真掌握所用药物有无配伍禁忌。同时应用两种或两种以上药物,称配伍用药,其目的是为了提高疗效或减少不良反应,或二者兼有。如小剂量的巴比妥类与麻黄碱合用防治支气管哮喘,可减弱麻黄碱的中枢兴奋作用。小剂量巴比妥类与解热镇痛药合用,可增强镇痛效果。然而有些药物配伍结果则适得其反,可使药效降低或毒性增 In order to ensure the safety and effectiveness of the medication, the doctor must carefully grasp the incompatibility of the drugs used when prescription. At the same time the application of two or more drugs, said the compatibility of drugs, its purpose is to improve the efficacy or reduce adverse reactions, or both. Such as small doses of barbiturates combined with ephedrine in the prevention and treatment of bronchial asthma, Ephedrine can reduce the central excitement. Small doses of barbiturates combined with antipyretic analgesics, can enhance the analgesic effect. However, some drug compatibility results are counterproductive, can reduce the efficacy or toxicity