Ranitidine Oral belongs to the class of H2 Receptor Antagonists. This drug blocks H2 receptors and suppresses the release of acid in stomach. This over-the-counter medicine is used for the treatment of Gastroesophageal Reflux Disease (GERD), Zollinger-Ellison Syndrome, esophagitis, peptic ulcer, stress ulcer, NSAID-induced stomach damage and other similar conditions. The side effects of Ranitidine Oral include - Headache - Nausea - Vomiting - Diarrhea or constipation - Stomach ache and discomfort - Breathlessness - Arrhythmia - Depression - Hallucination - Loss of mental clarity and confusion - Liver inflammation Ranitidine Oral interacts with the following drugs. - Delavirdine - Procainamide - Warfarin - Glipizide - Midazolam - Gefitinib - Atazanavir