Pharmacokinetics, every now and then abbreviated as PK, is a branch of pharmacology devoted to determining the fate of materials administered to a living organism. The substances of interest encompass any chemical xenobiotic such as: pharmaceutical capsules, pesticides, food additives, cosmetics, etc. Digoxin, specifically whilst given intravenously, is an example of a drug this is nicely defined by using - compartment pharmacokinetics. After an intravenous dose is administered, plasma concentrations upward thrust after which unexpectedly decline as drug distributes out of plasma and into muscle tissue.