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Title: Cisapride-cimetidine interaction: enhanced cisapride bioavailability and accelerated cimetidine absorption. Author: Kirch W, Janisch HD, Ohnhaus EE, van Peer A. Journal: Ther Drug Monit; 1989; 11(4):411-4. PubMed ID: 2741189. Abstract: The pharmacokinetic interaction between the gastrointestinal motility-stimulating substance cisapride and the H2-antagonist cimetidine was examined in 8 healthy volunteers (25 +/- 2 years of age). Steady-state kinetics of both substances were investigated after separate 1-week treatments of oral cisapride, 10 mg t.i.d., cimetidine, 400 mg t.i.d., and the two drugs combined. Cimetidine increased the cisapride peak plasma concentration from 58 +/- 25 ng/ml to 84 +/- 19 ng/ml (p = 0.01) and AUC0-24 from 509 +/- 289 ng/ml.h to 738 +/- 148 ng/ml.h (p = 0.02). Cisapride shortened the time to the peak concentration of cimetidine from 1.3 +/- 0.6 h to 0.6 +/- 0.2 h (p = 0.005) and reduced the cimetidine AUC0-24 from 11.0 +/- 2.3 micrograms/ml.h to 9.0 +/- 2.0 micrograms/ml.h (p = 0.05). It is concluded that cimetidine inhibits cisapride metabolism, whereas cisapride enhances the gastrointestinal absorption of cimetidine.[Abstract] [Full Text] [Related] [New Search]