Amoxicillin and ampicillin are not transferred to gastric juice irrespective of Helicobacter pylori status or acid blockade by omeprazole.

Abstract:

BACKGROUND:The effects of proton pump inhibitors and Helicobacter pylori infection on the distribution of drugs used for the eradication of the bacteria are poorly understood. AIM:The aim of this study was to investigate the effects of a 7-day administration of 20 mg of omeprazole on the pharmacokinetics of amoxicillin and ampicillin in the plasma, saliva and gastric juice of individuals with and without H. pylori infection. METHODS:Fifty-four healthy volunteers without endoscopic lesions were enrolled. Twenty-six volunteers were included in the amoxicillin study and 28 individuals in the ampicillin study. Each study had an open randomized two-period crossover design and a 21-day washout period between phases. Plasma, saliva and gastric juice concentrations of amoxicillin and ampicillin in subjects with and without omeprazole pre-treatment were measured by reversed-phase HPLC using UV detection. RESULTS:Neither pre-treatment with omeprazole nor H. pylori infection interfered with the plasma bioavailability of amoxicillin or ampicillin, as assessed by the AUC0-2 h. Neither ampicillin nor amoxicillin were detected in saliva or gastric juice in any study phase. CONCLUSION:Short-term treatment with omeprazole does not interfere with the pharmacokinetics of amoxicillin or ampicillin. Our results also exclude the presence of a transfer mechanism for amoxicillin or ampicillin from the plasma to the gastric lumen.

journal_name

Aliment Pharmacol Ther

authors

Ortiz RA,Calafatti SA,Corazzi A,Souza JM,Deguer M,De Souza CA,Marchioretto MA,Bernasconi G,Ferraz JG,Pedrazzoli J Jr

doi

10.1046/j.1365-2036.2002.01262.x

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

1163-70

issue

6

eissn

0269-2813

issn

1365-2036

pii

1262

journal_volume

16

pub_type

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