Active metabolite
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An active metabolite, or pharmacologically active metabolite is a biologically active metabolite of a xenobiotic substance, such as a drug or environmental chemical. Active metabolites may produce therapeutic effects, as well as harmful effects.[1]
Metabolites of drugs
An active metabolite results when a drug is metabolized by the body into a modified form which produces effects in the body. Usually these effects are similar to those of the
O-desmethyltramadol respectively) that are stronger than the parent drug[2][3][4] and in these cases the metabolite may be responsible for much of the therapeutic action of the parent drug. Sometimes, however, metabolites may produce toxic effects and patients must be monitored carefully to ensure they do not build up in the body. This is an issue with some well-known drugs, such as pethidine (meperidine) and dextropropoxyphene.[4][5]
Prodrugs
Sometimes drugs are formulated in an inactive form that is designed to break down inside the body to form the active drug. These are called
lisdexamphetamine).[6]
References
Further reading
- Nedderman, Angus N.R. & Walker, Don K. (2011). "Metabolite testing in drug development". In Bonate, Peter L. (ed.). Pharmacokinetics in Drug Development: Advances and Applications, Volume 3. Springer. ISBN 9781441979360.