“…21 Diamine oxidase is the main enzyme involved in histamine degradation, with predominant activity in the intestinal mucosa. 21 Alcohol and some drugs [imipenem, dobutamine, pancuronium, pentamidine, verapamil, isoniazid, clavulanic acid, dihydralazine, chloroquine, acetylcysteine, metoclopramide and cefuroxime] can reduce the activity of this enzyme and determine greater sensitivity to histamine-rich or histamine-producing foods [fish (tuna, sardine, anchovy), cheese (parmesan, Emmenthal, Gouda), salami, sausage, certain vegetables (tomato), wine and beers]. 21 Several experiments have demonstrated a diamine oxidase deficiency in the enterocytes of patients with chronic or recurrent urticaria 21 (grade of recommendation C).…”