At Zantac Antacid Cancer Lawsuit read complete information about the antacid and stomach cancer lawsuit for individuals or family members who have been diagnosed with cancer after taking acid reflux medications. Available by prescription and over-the-counter, antacids are used daily by millions of Americans who, until recently, believed the drugs were safe for routine use. Research shows that patients who have taken medications for acid reflux, GERD, heartburn, and similar complaints may develop stomach cancer, esophageal cancer, or bladder cancer as a result.