Comparison of effect of an increased dosage of vonoprazan versus vonoprazan plus lafutidine on gastric acid inhibition and serum gastrin.

Abstract

Vonoprazan, a novel potassium-competitive acid blocker, elicits potent acid inhibition and hypergastrinemia at a dose of 20mg. Its recommended maintenance dose for gastro-esophageal reflux disease is 10mg, which is sometimes insufficient for preventing nocturnal acid breakthrough (NAB). Concomitant use of a histamine 2 receptor antagonist (H2RA) is effective for NAB. However, further acid inhibition by addition of H2RA has concern of hypergastrinemia again. Lafutidine (H2RA) is known to stimulate somatostatin release. The aim of this study is to compare the levels of acid inhibition and serum gastrin attained by addition of lafutidine to vonoprazan 10mg with levels after a dose increase of vonoprazan from 10 to 20mg. Thirteen healthy volunteers underwent 24-h intragastric pH monitoring and serum gastrin measurements on day 7 of three different regimens: vonoprazan 10mg, vonoprazan 10mg plus lafutidine 10mg, and vonoprazan 20mg. Median pH4 holding time ratios (range) by vonoprazan 10mg, vonoprazan 10mg plus lafutidine 10mg, and vonoprazan 20mg were 82% (47-88%), 88% (76-93%), and 99% (95-100%) while those at nighttime from 10p.m. to 8a.m. were 94% (29-100%), 100% (95-100%), and 100%, respectively. The incidences of NAB with vonoprazan 10mg, vonoprazan plus lafutidine, and vonoprazan 20mg were 38, 8, and 0%, respectively. Respective serum gastrin levels were 420 (173-508), 323 (196-521), and 504 (400-812)pg/ml. Addition of lafutidine 10mg to vonoprazan 10mg achieved sufficient acid inhibition, especially at nighttime, without further increase of serum gastrin levels.