Pharmacokinetics is the process that refers to the movement of a pharmaceutical product into, through, and out of a living organism. It describes how the body affects a drug or vaccine.

Drugs undergo four phases in the process of pharmacokinetics:

  1. Absorption
  2. Distribution
  3. Metabolism
  4. Excretion.

The rate at which the drug is eliminated from the body is dependent on pharmacokinetics. Analysis and the understanding of pharmacokinetics guide drug development and therapeutic decision-making.

Source: Kufe, D. W., MD, Pollock, R. E., MD, Weichselbaum, R. R., MD, Bast, R. C., Jr, & Gansler, T. S., MD. (2003). Holland-Frei Cancer6 Medicine Review (6th ed.). Pmph USA Ltd.