Kirkland Signature Acid Controller 20mg, 250 Count Tablets

The active ingredient in Kirkland Signature Acid Controller Maximum Strength, 20 mg, an H2 Blocker. These partially block production of acid in the stomach cells by inhibiting histamine, a substance that stimulates the secretion of stomach acid. Over-the-counter and prescription H2 blockers relieve heartburn associated with acid indigestion and sour stomach and prevent meal-induced heartburn.