一、用药的目的和要求临床所用药物如该文所说可以分为两大类,即化疗药剂和“药效学类药物”(Pharmacodynamics);又说:属于后者“在症状发作时才能发挥作用,因此象许多镇痛药、止喘药等常在症状发作时服”。固然,镇痛药、止喘药发挥治疗的效果是通过调整机体的机能才达到。但即在症状没有发作时仍然可以发挥作用,麻黄硷在临床需要的情况下用于哮喘症发作的预防就是一例。而当哮喘症状发作时,不一定口服给药,有时为求速效,采用注射更好,这要看具 First, the purpose and requirements of the drug used in clinical medicine as the article said can be divided into two categories, namely, chemotherapy drugs and “Pharmacodynamics” (Pharmacodynamics); added: the latter "in the onset of symptoms When it can play a role, so like many analgesics, asthma drugs and other symptoms often onset service. Of course, analgesics, antiasthmatic drugs play a therapeutic effect is achieved by adjusting the body’s function. But it can still play its role in the absence of symptoms. Ephedrine is an example of prevention of asthma attacks when clinically needed. When the onset of asthma symptoms, not necessarily oral administration, and sometimes for quick, the use of injection is better, it depends on the device