Gaviscon provides fast acting, long lasting heartburn relief and is an acid reflux remedy. Relieves heartburn, sour stomach, acid indigestion, and upset stomach associated with these symptoms. Quickly neutralizes stomach acid and helps keep acid down for hours. Gaviscon is gastroenterologist recommended for heartburn and is available in both liquids and chewable tablets. Gaviscon Extra Strength Liquid Antacid Cherry flavor contains the active ingredients aluminum hydroxide and magnesium carbonate.