Detailed Explanation
Pharmacokinetics describes the quantitative relationship between drug dose and concentrations in the body over time, characterizing how organisms process pharmaceutical substances. Often summarized by the acronym ADME, pharmacokinetics encompasses absorption (how the drug enters the systemic circulation), distribution (how the drug disperses throughout body tissues), metabolism (how the drug is chemically modified, primarily in the liver), and excretion (how the drug and its metabolites are eliminated from the body). Understanding these processes is essential for rational dose selection and optimization.