Active metabolite

An active metabolite is a product formed when an organism chemically transforms a drug, and it retains pharmacological activity.

Drug metabolism: The enzymatic and chemical transformation of drugs in an organism. Active metabolites arise when drug metabolism produces compounds that still affect biological targets.
Morphine: An opioid analgesic used to treat severe pain. Morphine is formed from codeine and contributes to codeine’s analgesic effect.
Drug interaction: A change in a drug’s effects caused by another drug, food, or substance. Interactions can alter the enzymes that form or clear active metabolites.
Metabolism: The chemical reactions that sustain life by transforming molecules in organisms. Drug metabolism is one specialized part of this broader set of transformations.
Cytochrome P450: A family of enzymes that oxidizes many drugs and other foreign compounds. These enzymes generate many active metabolites through oxidation.
Codeine: An opioid drug used to treat pain and, in some formulations, cough. Its conversion to morphine illustrates how an active metabolite can mediate a parent drug’s effects.
Pharmacogenomics: The study of how genetic variation affects drug response and drug handling. Variants in metabolic enzymes can change active-metabolite exposure and treatment response.
Metabolite: A molecule produced or consumed by metabolic reactions in an organism. An active metabolite is the subset of metabolic products that retain drug-like activity.
Prodrug: A compound administered in an inactive or less active form that becomes pharmacologically active after metabolic conversion. A prodrug depends on metabolism to gain activity, whereas an active metabolite is defined by retaining it.
Diazepam: A benzodiazepine drug used for anxiety, seizures, muscle spasm, and alcohol withdrawal. Its long-lived active metabolites can extend sedative and anxiolytic effects.

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