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Pharmacokinetic and pharmacodynamic interactions between omeprazole and amoxycillin in Helicobacter pylori-positive healthy subjects.

Pommerien, W ; Braun, M ; Idströ ; m, J P ; Wrangstadh, M ; Londong, W ;
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    BACKGROUND: Omeprazole with amoxycillin has been used to treat Helicobacter pylori infection. It was speculated that omeprazole-induced hypoacidity enhances the antibacterial activity of amoxycillin. Limited information exists about intragastric pH and bioavailability of amoxycillin during combination therapy. No data are available about possible effects of the antibiotic on the pharmacokinetics and pharmacodynamics of omeprazole. METHODS: The study was performed in a three-way cross-over double-blind design. After a run-in period on placebo with a baseline intragastric pH-metry, 24 H. pylori-positive healthy subjects were randomly dosed with amoxycillin 750 mg b.d. + placebo, amoxycillin 750 mg b.d. + omeprazole 40 mg b.d. and omeprazole 40 mg b.d. + placebo for 5 days. On the last day of each regimen intragastric pH-metries were performed, and blood samples taken for omeprazole and amoxycillin serum profiles. RESULTS: Amoxycillin monotherapy had no acid-inhibiting effect. Median pH during combined dosing was significantly lower, compared to omeprazole monotherapy (P


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