Dose-Response Relationship: PD examines the relationship between the concentration of the drug at the target site and the intensity of the resulting effect. This help determines the therapeutic window—the range between a dose that is effective and a dose that becomes toxic.
Distribution: Once in the blood, the drug is carried to various tissues and organs. Distribution depends on blood flow, the drug’s ability to cross cell membranes (like the blood-brain barrier), and its tendency to bind to plasma proteins. Basic Pharmacokinetics and Pharmacodynamics: An...
Pharmacokinetics describes the movement of a drug into, through, and out of the body. This process is typically divided into four stages, often referred to by the acronym ADME: Distribution depends on blood flow, the drug’s ability
Metabolism: The body, primarily the liver, chemically alters the drug to make it easier to excrete. This often involves transforming active drugs into inactive metabolites, though some "prodrugs" are designed to become active only after metabolism. This often involves transforming active drugs into inactive
Pharmacology is built on two fundamental pillars: pharmacokinetics (PK) and pharmacodynamics (PD). Understanding these concepts is essential for determining how drugs move through the body and how they exert their therapeutic effects. While they are distinct fields of study, they are deeply interrelated and together dictate the clinical outcome of any drug therapy. Pharmacokinetics: What the Body Does to the Drug
Pharmacodynamics focuses on the biochemical and physiological effects of drugs and their mechanisms of action. It explores how a drug interacts with its target to produce a change.
Basic Pharmacokinetics and Pharmacodynamics: An Introduction