Combined ulcerogenic effect of ethanol and acetylsalicylic acid on the gastric mucosa of the rat.

The effect on rat gastric mucosa of ethanol and acetylsalicylic acid given at two doses singly or in combination were studied by administering the drugs into the stomach. 40% ethanol alone caused many ulcerations after 5 h, and the effect was even more marked with simultaneous administration of acetylsalicylic acid (ASA). 10% ethanol and 50 mg ASA/kg b. wt. were tolerated well. The mucosal lesions consisted of coagulation necrosis and hemorrhages, with a disappearance of histamine and serotonin from the mucosal mast cells in and around the lesion.