pharmacokinetics

n. study of the activity and interaction of medications within the body (including absorption, distribution, metabolism, and excretion)

Pharmacokinetics (in Greek: "pharmacon" meaning drug and "kinetikos" meaning putting in motion, the study of time dependency) is a branch of pharmacology dedicated to the determination of the fate of substances administered externally to a living organism. In practice, this discipline is applied mainly to drug substances, though in principle it concerns itself with all manner of compounds ingested or otherwise delivered externally to an organism, such as nutrients, metabolites, hormones, toxins, etc. Pharmacokinetics is often divided into several areas including, but not limited to, the extent and rate of Absorption, Distribution, Metabolism and Excretion. This sometimes is referred to as the ADME scheme.
See more at Wikipedia.org...

Pharmacokinetics /phar·ma·co·ki·net·ics/ the action of drugs in the body over a period of time, including the processes of absorption, distribution, [more]Pharmacokinetics - Community and Resources

Noun
1. the study of the action of drugs in the body: method and rate of excretion; duration of effect; etc.
(hypernym) pharmacology, pharmacological medicine, materia medica

The activity of drugs in the body over a period of time, including the processes by which drugs are absorbed, distributed in the body, localized in the tissues, and excreted.