Know this term...https://en.wikipedia.org/wiki/Pharmacokinetics
Pharmacokinetics (from
Ancient Greek pharmakon "drug" and
kinetikos "moving, putting in motion"; see
chemical kinetics), sometimes abbreviated as
PK, is a branch of
pharmacology dedicated to determining the fate of substances administered to a living organism. The substances of interest include any chemical
xenobiotic such as:
pharmaceutical drugs,
pesticides,
food additives,
cosmetics, etc. It attempts to analyze chemical
metabolism and to discover the fate of a chemical from the moment that it is administered up to the point at which it is completely
eliminated from the body. Pharmacokinetics is the study of how an organism affects a drug, whereas
pharmacodynamics (PD) is the study of how the drug affects the organism. Both together influence
dosing, benefit, and
adverse effects, as seen in
PK/PD models.
Great crash course here ... https://www.youtube.com/watch?v=8-Qtd6RhfVA