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This is a description of an antacid tablet manufactured by Guardian Drug Company. It is called "Regular Strength LS Antacid Tablets" and contains calcium carbonate (500 mg) as its active ingredient. The tablet is designed to relieve acid indigestion and heartburn. The tablets come in assorted fruit flavors and the container has 150 chewable tablets. The directions suggest taking a maximum of 15 tablets in a 24-hour period and caution that the product may interact with certain prescription drugs. The tablet should be kept at room temperature and out of reach of children. The container also lists the inactive ingredients, which include crospovidone, DEC red 27 lake, and others.*