title: The comparative effects of lansoprazole, omeprazole, and ranitidine in suppressing gastric acid secretion.
abstract: The effects on 24-hour intragastric pH levels of once-daily doses of lansoprazole 15 mg and lansoprazole 30 mg were compared with the effects of omeprazole 20 mg QD and ranitidine 150 mg QID in a phase I, randomized, double-masked, four-way crossover study conducted in 29 healthy male volunteers. Subjects received each treatment regimen for 5 consecutive days with at least a 2-week washout between treatment periods. Ambulatory 24-hour intragastric pH values were monitored in each subject at baseline (2 days before crossover period 1) and again before dosing on day 5 of each of the four crossover treatment periods. Gastric pH values increased during all four regimens, with significantly higher mean 24-hour pH values noted in subjects receiving lansoprazole 30 mg QD (4.53 +/- 0.16) compared with those receiving lansoprazole 15 mg QD (3.97 +/- 0.16), omeprazole 20 mg QD (4.02 +/- 0.16), or ranitidine 150 mg QID (3.59 +/- 0.16). Lansoprazole 30 mg produced significantly greater mean percentages of time that the gastric pH was above 3.0 and 4.0 (75% and 63%, respectively) compared with the other treatment regimens. The mean percentages of time during which gastric pH was above 3.0 and 4.0, respectively, for the other treatments were lansoprazole 15 mg, 64% and 48%; omeprazole 20 mg, 63% and 51%; and ranitidine 150 mg, 52% and 38%. All treatment regimens were well tolerated, with no clinically significant differences between the regimens. Multiple-dose lansoprazole 30 mg QD produced a significantly increased intragastric pH level and significantly longer durations of increased intragastric pH level compared with lansoprazole 15 mg QD, omeprazole 20 mg QD, and ranitidine 150 mg QID.
authors.affiliation: Millard Fillmore Hospital, Buffalo, New York, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Blum
authors.forename: H
authors.initials: H
authors.lastname: Shi
authors.forename: M D
authors.initials: MD
authors.lastname: Karol
authors.forename: P A
authors.initials: PA
authors.lastname: Greski-Rose
authors.forename: R H
authors.initials: RH
authors.lastname: Hunt
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D000897:Anti-Ulcer Agents / Q000493:pharmacokinetics / Q000494:pharmacology*; D018592:Cross-Over Studies; D004791:Enzyme Inhibitors / Q000493:pharmacokinetics / Q000494:pharmacology*; D005744:Gastric Acid / Q000378:metabolism*; D005753:Gastric Mucosa / Q000187:drug effects* / Q000378:metabolism; D006635:Histamine H2 Antagonists / Q000493:pharmacokinetics / Q000494:pharmacology*; D006801:Humans; D064747:Lansoprazole; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000031:analogs & derivatives* / Q000493:pharmacokinetics / Q000494:pharmacology*; D054328:Proton Pump Inhibitors; D011899:Ranitidine / Q000493:pharmacokinetics / Q000494:pharmacology*
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000897:Anti-Ulcer Agents; D004791:Enzyme Inhibitors; D006635:Histamine H2 Antagonists; D054328:Proton Pump Inhibitors; D064747:Lansoprazole; D011899:Ranitidine; D009853:Omeprazole