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In this study, we investigated the effects of antibiotics on the pharmacological effects of aspirin. The antithrombotic activity of aspirin was evaluated after antibiotic treatment using tail bleeding assay. The pyrosequencing analysis and selective medium culture assay were performed to investigate the alterations in gut microbiota. In addition, the in vitro metabolism assay with fecal suspension and in vivo pharmacokinetic experiments with antibiotic treatment were conducted. Ampicillin treatment significantly prolonged the bleeding time in aspirin-dosed rats. [Oral administration of ampicillin significantly reduced gut microbial aspirin-metabolizing activity by 67.0% in rats](brain://u2Rih2OSE0-q…