外用药是外科用于涂、擦、洗的药物。外用药的主要作用是杀虫解毒、化腐生肌、排脓止痛,收敛止血等。因大多具有毒性,使用不慎容易引起中毒。故必须控制剂量,慎重使用。这类药物虽以外用为主,但其中一部分可供内服,内服时宜作丸剂,取其缓慢吸收之功效。 External medicine is a medicine used for painting, rubbing, and washing. The main role of external medicine is insecticide detoxification, rot myogenic, discharge pus pain, convergence hemostasis. Due to the fact that they are mostly toxic, intoxication is easily caused by careless use. Therefore, it is necessary to control the dose and use it with caution. Although these drugs are mainly used for external use, some of them are available for internal use and should be taken as pills when taken orally, so that they can absorb slowly.