Zantac 150mg Zantac (Ranitidine) Duodenal ulcer and benign gastric ulcer, including that associated with non-steroidal anti-inflammatory agents. Prevention of non-steroidal anti-inflammatory drug (NSAID) (including aspirin) associated duodenal ulcers, especially in patients with a history of peptic ulcer disease. Treatment of duodenal ulcers associated with Helicobacter pylori infection. Post-operative ulcer.