Product Details Aluminum hydroxide, 254 mg. Magnesium carbonate, 237.5 mg. Antacid. Fast-acting heartburn relief. Helps keep acid down for hours. Compare to Gaviscon extra strength active ingredients (This product is not manufactured or distributed by GlaxoSmithKline, owner of the registered trademark Gaviscon Extra Strength). 100% money back guarantee. Return to place of purchase. www.myleader.com.