what drugs are considered antacids?
['Aluminum hydroxide gel (Alternagel, Amphojel)', 'Calcium carbonate (Alka-Seltzer, Tums)', 'Magnesium hydroxide (Milk of Magnesia)', 'Gaviscon, Gelusil, Maalox, Mylanta, Rolaids.', 'Pepto-Bismol.']