药物既对机体有作用,机体对药物又有反作用。药物代谢动力学(药动学)是研究机体对药物反作用的科学,内容包括药物的吸收、分布和消除(代谢及排泄),主要是动态地探讨药物入体后的“时一效”或“时-量”关系。一、必须了解的几个基本概念1.半衰期。以t1/2表示,含义是体内药物(或血 Drugs have both the role of the body, the body has a negative effect on the drug. Pharmacokinetics (pharmacokinetics) is to study the body’s reaction to the drug science, including drug absorption, distribution and elimination (metabolism and excretion), mainly to dynamically explore the drug into the body after the “one effect” or “ Time - volume ”relationship. First, we must understand a few basic concepts 1. Half-life. To t1 / 2, meaning the body of drugs (or blood