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Concept
Drug class
Summary
A drug class is a group of medications and other compounds that have similar chemical structures, the same mechanism of action (i.e. binding to the same biological target), similar modes of action, and/or are used to treat the similar diseases.
In several dominant drug classification systems, these four types of classifications form a hierarchy. For example, the fibrates are a chemical class of drugs (amphipathic carboxylic acids) that share the same mechanism of action (PPAR agonist) and mode of action (reducing blood triglycerides), and that are used to prevent and treat the same disease (atherosclerosis). Conversely, not all PPAR agonists are fibrates, not all triglyceride lowering agents are PPAR agonists, and not all drugs used to treat atherosclerosis are triglyceride-lowering agents.
A drug class is typically defined by a prototype drug, the most important, and typically the first developed drug within the class, used as a reference for comparison.
Anatomical Therapeutic Chemical Classification System (ATC) – most widely used. Combines classification by organ system and therapeutic, pharmacological, and chemical properties.
Systematized Nomenclature of Medicine (SNOMED) – includes a section devoted to drug classification
This type of categorisation of drugs is from a chemical perspective and categorises them by their chemical structure. Examples of drug classes that are based on chemical structures include:
Benzodiazepine
Cardiac glycoside
Fibrate
Steroid
Thiazide diuretic
Triptan
β-lactam antibiotic
This type of categorisation is from a pharmacological perspective and categorises them by their biological target. Drug classes that share a common molecular mechanism of action modulate the activity of a specific biological target. The definition of a mechanism of action also includes the type of activity at that biological target. For receptors, these activities include agonist, antagonist, inverse agonist, or modulator. Enzyme target mechanisms include activator or inhibitor. Ion channel modulators include opener or blocker.
Official source
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