Distribution in pharmacology is a branch of pharmacokinetics describing reversible transfer of drug from one location to another within the body. Pharmacology (in Greek: pharmacon (φάρμακον) meaning drug, and logos (λόγος) meaning science) is the study of how chemical substances interact with living systems. ... Pharmacokinetics is a branch of pharmacology dedicated to the study of the time course of substances and their relationship with an organism or system. ...

The distribution of a drug between tissues is dependent on permeability between tissues (between blood and tissues in particular), blood flow and perfusion rate of the tissue and the ability of the drug to bind plasma proteins and tissue. Permeability has several meanings: In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field. ... Perfusion is a physiological term that refers to the process of nutritive delivery of arterial blood to a capillary bed in the biological tissue. ... Blood proteins are proteins found in blood plasma. ...

The volume of distribution of a drug is property that quantifies the extent of distribution. The volume of distribution (VD) is a pharmacological term used to quantify the distribution of a drug throughout the body after oral or intravenous dosing. ...