How does this medication work? What will it do for me? Ranitidine belongs to the class of medications called H2-antagonists. Ranitidine is used to reduce the amount of acid secreted by the stomach in order to reduce ulcer and heartburn pain or to assist in healing of ulcers. But they dont work for everyone. Even if youre one of those people who does well on PPIs you can still have “breakthrough” symptoms from time to time, when heartburn flares into an agonizing. Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, expect. I don't know but I feel your frustration. I know that the more hypo I am the more constipation issues I incur! Also, keep in mind that Zantac can cause looser GI issues so don't be surprised just in case that happens. Zantac belongs to a group of drugs called histamine-2 blockers. Ranitidine works by reducing the amount of acid your stomach produces. Zantac is used to treat and prevent ulcers in the stomach and intestines. Prilosec and Zantac are medications used to treat digestive problems such as gastroesophageal reflux disease (GERD). They both work by reducing the amount of acid in your stomach, but Prilosec and. Why does my allergy symptoms subside when I take Zantac 150 mg. daily? It stops the hives, itching and swelling of body parts. My doctor prescribed this says it would mask the problem. But what problem, all the tests should no allergies or any other results that would be abnormal. Zantac is used to treat and prevent ulcers in the stomach and intestines. It also treats conditions in which the stomach produces too much acid. ZANTAC ® works to provide fast and lasting relief of the burning and discomfort of heartburn, acid indigestion, upset stomach and sour stomach 45. It does this thanks to its active ingredient ranitidine.