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Omeprazole has no effect on acetaminophen kinetics in the rat
1Gastroenterology Department, Sheba Medical Center, Tel Hashomer, Israel.
European Journal of Drug Metabolism and Pharmacokinetics
|April 1, 1995
Summary
Omeprazole, a proton pump inhibitor, does not alter acetaminophen pharmacokinetics in rats. This study indicates omeprazole (H+/H(+)-ATPase inhibitor) does not increase the risk of acetaminophen toxicity.
Area of Science:
- Pharmacology
- Drug Metabolism
- Toxicology
Background:
- Omeprazole is a widely used proton pump inhibitor.
- Acetaminophen is a common analgesic and antipyretic.
- Potential drug interactions between omeprazole and acetaminophen require investigation.
Purpose of the Study:
- To investigate the effect of omeprazole on the pharmacokinetics of acetaminophen in rats.
- To determine if omeprazole alters acetaminophen clearance and elimination.
- To assess the potential for omeprazole to increase acetaminophen toxicity.
Main Methods:
- Rats were administered omeprazole (50 mg/kg/day) or vehicle for 7 days.
- Pharmacokinetic parameters of acetaminophen were determined on day 7.
- Key parameters included elimination rate constant, half-life, clearance, and volume of distribution.
Main Results:
- Omeprazole treatment did not significantly affect the elimination rate constant of acetaminophen.
- The elimination half-life, clearance, and volume of distribution of acetaminophen remained unchanged.
- No pharmacokinetic alterations were observed in rats treated with omeprazole.
Conclusions:
- Omeprazole does not influence the pharmacokinetics of acetaminophen in the rat model.
- The findings suggest that co-administration of omeprazole and acetaminophen is unlikely to increase acetaminophen toxicity in rats.
- Further studies may be warranted to confirm these findings in humans.