EFFECT OF CIMETIDINE AND OMEPRAZOLE ON GASTRIC-ULCER HEALING OF RATS WITH LIMITED FOOD-INTAKE TIME

The effects of cimetidine, omeprazole and atropine sulfate on the heal ing of acetic acid-induced gastric ulcers in rats with limited food in take time (9:00-10:00 a.m. and 5:00-6:00 p.m.) were evaluated 15 days after the acid injection. Oral repeated administration of cimetidine ( 25-100 mg/kg twice daily) or omeprazole (10-50 mg/kg once daily) dose dependently accelerated ulcer healing. Atropine sulfate (10 mg/kg twic e daily, p.o.) was ineffective. A single oral administration of omepra zole (50 mg/kg) or cimetidine (100 mg/kg) resulted in potent and long- lasting anti-acid secretory and gastrin-releasing actions. The degree and duration of anti-acid secretion by atropine sulfate were equal to those of cimetidine, but the elevation of gastrin release by atropine sulfate was weak and temporary. These results indicate that the gastri c ulcers of rats with a limited food intake time are useful for evalua ting the healing effects of cimetidine and omeprazole on gastric ulcer s. In addition, the effects of both drugs may be related to the increa sed gastrin release rather than to the reduced acid secretion.