Haloperidol (1 mg) intra-arterially attenuates the dopamine-induced pancreatic secretion. Haloperidol (3 mg) completely inhibits the action of 10 μg of dopamine in the pancreas of the dogs [1]. Haloperidol (10 mg/kg) and chlorpromazine (CPZ, 15 mg/kg) blocks mescaline-induced altered behavior within 7 to 10 minutes when injected into the mice 45 minutes after 50 mg/kg (2 μc) of mescaline. Haloperidol has no effect on disappearance of mescaline [2].