Pharmacokinetics may be simply defined as what the body does to the drug, as opposed to
pharmacodynamics which may be defined as what the drug does to the body.
Pharmacokinetics: Basic Principles and Its Use as a Tool in Drug Metabolism, p. 199 in Drug Metabolism and Drug Toxicity, Mitchell JR, Horning MG, editors eds., Raven Press, New York, 1984.