First order kinetics means that a drug ___________.

Question

Quizplus · Accepted Answer

First order means that the drug is removed exponentially from the body or at a constant proportion (while a fixed amount leaves the body during zero order kinetics).Half-life is that time it takes for drug levels to decrease by 50%.If blood levels of a drug fall from 5 mg/ml to 2.5 mg/ml in 4 hrs,then the half-life of this drug is 4 hrs.It takes about 4-5 half-lives to achieve steady state levels of the drug in the body or to become fully active and it also takes about 4-5 half-lives for most of the drug to have left the body.

First Order Kinetics Means That a Drug ___________