Famotidine
"I have GERD, and Irritable Bowel Syndrome. For my GERD, it is cheaper to buy OTC medicines rather than prescription version. I take famotidine 10mg tablets twice day before meals.  I take this along with 200mg Cimetidine. For the cimetidine I take 2 tablets twice a day. This therapy works great for me and my doctor is glad I finally found a relief."