title: The effect of cimetidine on immunological parameters in Crohn's disease: a double blind trial.
abstract: Thirty-six patients with Crohn's disease were entered into a double-blind trial to assess any beneficial effect that cimetidine might have on immunological and clinical status. Eighteen patients were randomized to receive cimetidine, 1 g orally for 28 days, and the other 18 patients to receive a placebo. There was no alteration in clinical status in the cimetidine-treated group. Although 64% of the patients were anergic, augmentation of skin tests to candida, mumps, tuberculin, streptokinase/streptodornase and trichophyton antigens, was not observed in the cimetidine-treated patients. The patients with Crohn's disease, as a whole had higher absolute numbers of suppressor T-lymphocytes, 0.70 X 10(9)/litre (0.21-2.36, n = 35) compared to control values, 0.5 X 10(9)/litre (0.16-1.55, n = 25) (P less than 0.05). However, there was no significant difference in proportions of suppressor and helper T-lymphocytes, lymphocyte activation and humoral immunity after cimetidine treatment. The lack of any clear modulation of immunity by cimetidine, would be against trying H2 antagonists in a long term clinical trial.
mesh_terms: D000328:Adult; D002927:Cimetidine / Q000494:pharmacology*; D003176:Complement C3 / Q000032:analysis; D003181:Complement C4 / Q000032:analysis; D003424:Crohn Disease / Q000276:immunology*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007108:Immune Tolerance; D007136:Immunoglobulins / Q000032:analysis; D007958:Leukocyte Count; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
chemical_list: D003176:Complement C3; D003181:Complement C4; D007136:Immunoglobulins; D002927:Cimetidine