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A prodrug is a substance administered in an inactive or less active form that is converted in the body into a pharmacologically active drug. Conversion commonly occurs through enzymes but can also involve chemical processes. A prodrug is designed to improve one or more properties of the active medicine. Its effectiveness depends partly on how reliably the conversion occurs.
read more about prodrug ...Prodrugs can improve absorption, solubility, stability, taste, tissue delivery, or duration of action. They can help an active drug cross a biological barrier or reduce irritation at the administration site. Some designs release the active medicine preferentially in a target tissue. The prodrug approach can also simplify formulation when the active compound has difficult physical or chemical properties.
Enzymes in the liver, intestine, blood, or target tissues can remove or alter part of the prodrug molecule. Hydrolysis, oxidation, reduction, and other metabolic reactions can produce the active drug. Activation can occur in one step or through several intermediate metabolites. Genetics, organ function, age, disease, and interacting medicines can change the rate of conversion.
Enalapril is converted to enalaprilat, and valacyclovir is converted to acyclovir. Clopidogrel requires metabolic activation to form a compound that inhibits platelets. Fosphenytoin is converted to phenytoin after administration. These examples use different activation pathways and were developed for different formulation or delivery reasons.
Reduced activation can cause treatment failure, while unusually rapid or extensive activation can increase toxicity. Enzyme inhibitors, enzyme inducers, genetic variants, and impaired liver or kidney function can alter exposure to the prodrug or active compound. The active drug and intermediate metabolites can each have separate adverse effects. Dose selection and interaction review must consider the complete activation and elimination pathway.
Many prodrugs have little or no intended activity before conversion, but some retain partial activity. The defining feature is that transformation produces an active drug responsible for all or part of the effect.
No. A prodrug is the administered precursor, while an active metabolite is the active compound formed after the body processes a drug. A prodrug can generate one or more active metabolites.
Yes. Genetic variation in an activating enzyme can reduce or increase production of the active compound. This can change effectiveness or toxicity for selected prodrugs.
The active drug can have poor absorption, low solubility, instability, unpleasant taste, or difficulty reaching the target tissue. A prodrug can improve one or more of these properties.
The Expanding Role of Prodrugs in Contemporary Drug Design and Development. Nature Reviews Drug Discovery. https://www.nature.com/articles/nrd.2018.46. Date Accessed August 6, 2026.
Enalapril Maleate Tablets: Prescribing Information. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a62de3e5-3508-4d4a-9518-65b8fb23b3be. Date Accessed August 6, 2026.
Valacyclovir Hydrochloride Tablets: Prescribing Information. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=c33a2a36-16d3-4a35-e053-2995a90af240. Date Accessed August 6, 2026.
Clopidogrel Tablets: Prescribing Information. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=edae8df1-caf9-ff72-1304-5ae8b355f8e7. Date Accessed August 6, 2026.
Fosphenytoin Sodium Injection: Prescribing Information. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=87ff8a91-5b37-401c-b75c-dc6efd348761. Date Accessed August 6, 2026.