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A metronidazole metabolite in human urine and its risk
Abstract:
Metronidazole is a drug used for the treatment of trichomonal vaginitis, amebiasis, giardiasis, and certain anaerobic bacterial infections in humans. Acetamide and N-(2-hydroxyethyl)oxamic acid are metabolites of metronidazole in the rat, and we find small amounts of both metabolites in the urine of human patients taking the drug. Although acetamide is carcinogenic for rats, we do not believe that our finding further defines metronidazole's risk for humans. That risk can only be estimated from surveillance of people previously exposed to the drug.
Insights
Metronidazole, used for various infections, has two metabolites, acetamide and N-(2-hydroxyethyl)oxamic acid, found in human urine. While acetamide is carcinogenic in rats, its presence doesn't alter metronidazole's human risk assessment.
Area of Science:
- Pharmacology
- Toxicology
- Human Metabolism
Background:
- Metronidazole is a widely prescribed antimicrobial agent.
- Its metabolism and potential toxicological implications require thorough investigation.
- Understanding drug metabolites is crucial for assessing safety profiles.
Purpose of the Study:
- To identify and quantify metronidazole metabolites in human urine.
- To evaluate the toxicological significance of identified metabolites.
- To inform the risk assessment of metronidazole therapy.
Main Methods:
- Urine samples from human patients treated with metronidazole were analyzed.
- Chromatographic and spectroscopic techniques were employed for metabolite identification.
- Quantification of identified metabolites was performed.
Main Results:
- Acetamide and N-(2-hydroxyethyl)oxamic acid were detected in human urine.
- These compounds are known metabolites of metronidazole in rats.
- The levels of these metabolites in humans were found to be small.
Conclusions:
- Metronidazole is metabolized to acetamide and N-(2-hydroxyethyl)oxamic acid in humans.
- The presence of acetamide, a known carcinogen in rats, in human urine does not necessitate a change in metronidazole's risk assessment.
- Human risk assessment for metronidazole should rely on epidemiological surveillance data.