Drugs such as Nexium, Prilosec and Prevacid that control production of stomach acid and treat heartburn, reflux, peptic ulcers and related conditions are some of the most popular medications on the market
http://www.courierpress.com/news/2011/aug/01/popular-heartburn-drugs-may-increase-esophageal-ca/?partner=RSS
Popular heartburn drugs may increase esophageal cancer risk