设机体静注某药剂量 D 后,得到初浓度C_0,经过一个 t_1/2,血药浓度 C 从 C_0降至C_0/2,记该浓度以后的药-时曲线为1_1(附图)。如果静注剂量为 D/2,则也可得到一条以 C_0/2为初浓度的药-时曲线1_2(附图)。这两条曲线的关系,易引起这样的误解:既然是同一个体,且开始时浓度相等,因而在实验误差范围内两条曲线应该是相等的,即将曲 Let the body concentration of a drug intravenous injection of D, the initial concentration of C_0, after a t_1 / 2, blood concentration C decreased from C_0 C_0 / 2, the concentration of the drug-time curve after 1_1 (with photos). If the intravenous dose is D / 2, a drug-time curve 1_2 with an initial concentration of C_0 / 2 can also be obtained (figure). The relationship between these two curves can easily lead to the misunderstanding that since they are the same individual and have the same initial concentration, the two curves should be equal within the experimental error range,