ranitidine 150 mg Ranitidine is commonly used to treat conditions related to excessive stomach acid production. It is an H2 receptor antagonist, reducing stomach acid by blocking histamine receptors in the stomach lining. Ranitidine is primarily prescribed for the treatment of gastroesophageal reflux disease (GERD), peptic ulcers, and erosive esophagitis.buy ranitidine It provides relief from symptoms such as heartburn, acid indigestion, and sour stomach. Additionally, ranitidine can be used to prevent acid-related damage in certain scenarios, such as before anesthesia.