Abstract
Both chlorpromazine and NSD‐1055 (a non‐steroidal anti‐inflammatory drug) markedly lower the volume and acidity of gastric contents of rats subjected to pyloric ligation (Shay technique) and reduce the degree of ulceration in the stomach. On the other hand, aminoguanidine (an inhibitor of histaminase) has no effect on acid secretion or ulceration in these animals.