Intestinal Angioedema Induced by Promethazine in a Postoperative Patient With Gastric Cancer: A Case Report.

Intestinal angioedema is a rare but severe manifestation of hypersensitivity that mimics acute abdomen. This first reported case of promethazine-induced intestinal angioedema underscores the importance of recognizing drug-induced etiologies to prevent unnecessary surgery and enable conservative management.