Pharmacokinetics​​1​​, sometimes described as what the body does to a drug, refers to the movement of drug into, through, and out of the body - the time course of its absorption, bio-availability, distribution, metabolism, and excretion. The study of these effects are called Pharmacodynamics, and is the study of the biochemical and physiologic effects of drugs. The effects can include those manifested within animals, microorganisms, or combinations of organisms. (see: Wikipedia)