zantac Pepcid rival Heartburn medicine brand Tagamet alternative OTC antacid brand Indigestion drug Brand of heartburn medicine Brand for heartburn "Heartburn? Attack it" drug Warner-Lambert product Acid blocker sold over the counter Antiulcer pill Remedy for acid reflux Tagamet competitor Ulcer treater A histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux