Gastric and duodenal ulcers were induced in rats by ethanol and cysteamine respectively. Anti peptic ulcer activity of the leaves of Abrus precatorius L., a plant of Eastern Himalaya, was studied in those experimental peptic ulcer models. Results were compared with omeprazole, a known drug for peptic ulcer. It was found out that Abrus precatorius L. exerted anti peptic ulcer activity against ethanol and cysteamine induced peptic ulcerations but the activity was less than that of omeprazole.