Product Details Aluminum hydroxide, 160 mg. Magnesium carbonate, 105 mg. Helps keep acid down for hours. Fast acting heartburn relief. Compare to Gaviscon Extra Strength Antacid active ingredients (This product is not manufactured or distributed by GlaxoSmithKline owner of the registered trademarks Gaviscon Extra Strength Antacid). Essential to care since 1979. 100% money back guarantee. All Leader Brand products have a 100% money back guarantee. Return to place of purchase if not satisfied. www.myleader.com.