Amoxicillin causing stomach acid. . This combination works to destroy the ulcer-causing . This combination is sometimes used with a stomach acid reducer called lansoprazole (Prevacid). medicine is helping your condition and is not causing . Indigestion is cause d by stomach acid coming into . Research shows that the bacteria (along with acid secretion) damage stomach and duodenal tissue, causing . . and E, is severely compromised, inadvertently causing . . . This combination is sometimes used ... more