title: Effect of low-dose omeprazole on gastric acid secretion in duodenal ulcer patients.
abstract: The effect of 7 days of oral dosing with 5 mg day-1 and 20 mg day-1 omeprazole on basal and pentagastrin-stimulated gastric acid output was studied in nine duodenal ulcer patients. Basal acid output measured 5-6 h post-dosing was decreased by a mean of 75% on 5 mg omeprazole and by 90% on 20 mg omeprazole (P less than 0.05 and P less than 0.01, respectively). Peak acid output measured 6-7 h post-dosing was decreased by a mean of 75% on 5 mg omeprazole and 97% on 20 mg omeprazole (P less than 0.01 for each). There was a wide interindividual variation in response to the 5 mg dose, with five of the nine patients having more than 90% inhibition of peak acid output, but two patients having less than 40% inhibition. This unpredictable response to daily low-dose omeprazole therapy makes it unsuitable for maintenance treatment.
authors.affiliation: Gastrointestinal Centre, Southern General Hospital, Glasgow, UK.
authors.forename: G
authors.initials: G
authors.lastname: McLauchlan
authors.forename: G P
authors.initials: GP
authors.lastname: Crean
authors.forename: K E
authors.initials: KE
authors.lastname: McColl
mesh_terms: D000328:Adult; D004311:Double-Blind Method; D004381:Duodenal Ulcer / Q000503:physiopathology*; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000008:administration & dosage / Q000009:adverse effects / Q000494:pharmacology*
chemical_list: D009853:Omeprazole