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The effect of cimetidine on the formation of methoxyflurane fluorometabolites in mice
Abstract:
Pre-dosing of mice with cimetidine reduced the plasma levels of inorganic fluoride, one of the fluorometabolites of methoxyflurane. The reduction occurred as early as 10 and as late as 160 minutes after cimetidine injection, and it was seen at both 30 and 100 minutes after subsequent methoxyflurane administration. Multiple pre-dosings with cimetidine did not notably affect the fluoride response. These results may be of use in avoiding methoxyflurane toxicity, which is thought to be due to markedly elevated fluoride levels in some patients.
Insights
Pre-dosing mice with cimetidine effectively lowered inorganic fluoride, a metabolite of methoxyflurane. This finding may help prevent methoxyflurane toxicity linked to high fluoride levels.
Area of Science:
- Pharmacology
- Toxicology
- Metabolism
Background:
- Methoxyflurane is an anesthetic agent.
- Methoxyflurane metabolism produces inorganic fluoride.
- Elevated fluoride levels are associated with methoxyflurane toxicity.
Purpose of the Study:
- To investigate the effect of cimetidine pre-dosing on methoxyflurane-induced inorganic fluoride levels in mice.
- To assess the potential of cimetidine in mitigating methoxyflurane toxicity.
Main Methods:
- Mice were pre-dosed with cimetidine.
- Methoxyflurane was administered subsequently.
- Plasma inorganic fluoride levels were measured at various time points.
Main Results:
- Cimetidine pre-dosing significantly reduced plasma inorganic fluoride levels.
- The reduction in fluoride levels was observed between 10 and 160 minutes post-cimetidine and 30-100 minutes post-methoxyflurane.
- Multiple cimetidine pre-dosings did not alter the observed fluoride reduction.
Conclusions:
- Cimetidine administration can lower inorganic fluoride levels resulting from methoxyflurane metabolism.
- This effect suggests a potential therapeutic strategy to reduce methoxyflurane-induced toxicity.