Definition- Pharmacology is the science of the study of substances that interact with living systems through chemical processes, especially by binding to regulatory molecules and activating or inhibiting normal body processes.

Definition- Absorption is the transfer of a drug from the site of administration to the bloodstream(systemic
circulation)

- Bioavailability is the rate and extent to which an administered drug by any route reaches the systemic circulation.

For example, if 100 mg of a drug is administered orally and 70 mg is absorbed unchanged, the bioavailability is 0.7 or 70%.

Drug distribution
• It refers to the reversible transfer of a drug between the blood and the extra vascular fluids and tissues
of the body (for example, fat, muscle, and brain tissue).

Biotransformation of drugs is defined as the chemical conversion of one form to another. • The term is used synonymously with metabolism..

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