Antacids are used to treat acid reflux that causes heartburn, indigestion, and stomach upset. They provide quick relief from heartburn, which is a major symptom of gastroesophageal reflux disease and indigestion. Treatment with antacids is symptomatic and is usually recommended for minor symptoms. Antacids include magnesium carbonate, aluminum hydroxide, and magnesium trisilicate. Some people have reported allergic reactions to antacids. Antacids with magnesium may cause diarrhea, while those containing calcium and aluminum may cause constipation. Long-term use may cause kidney stones and may increase the risk of contracting osteoporosis. Popular antacid brands include Alka seltzer, Gelusil, Milk of Magnesia, Maalox, Gaviscon, Mylanta, Rolaids, and Tums.