Rolaids, Eno, Tums, Maalox, and Gaviscon are all brands of antacid, a type of medication used to relieve heartburn, indigestion, and other symptoms of acid reflux. Rolaids is a seven-letter brand, Eno is a three-letter brand, Tums is a four-letter brand, Maalox is a six-letter brand, and Gaviscon is an eight-letter brand. All of these brands are available over the counter and can be used to treat the symptoms of acid reflux.