title: Re-introduction of azathioprine in previously intolerant patients.
abstract: OBJECTIVE
  Azathioprine is an important steroid sparing agent in the management of patients with inflammatory bowel disease. However, side effects are a problem in a significant minority of patients. We proposed that desensitization might increase the number of patients able to tolerate the drug.
  
  
  METHODS
  Successive inflammatory bowel disease patients who were intolerant to azathioprine in our hospital gastroenterology clinic were invited to recommence the drug at a low dose, gradually building up to a therapeutic dose. Patients were observed for the recurrence of side effects. Patients who did not wish to participate were offered alternative immunosuppressant therapy.
  
  
  RESULTS
  Fourteen patients elected to attempt desensitization. Nine of these (64%) were able to tolerate a full dose of azathioprine. The remainder suffered a return of their side effects and were offered alternative treatment.
  
  
  CONCLUSIONS
  Azathioprine can be tolerated in some people who have been previously intolerant by the use of desensitization.
authors.affiliation: Department of Gastroenterology, Royal Berkshire Hospital, Reading, UK.
authors.forename: Caroline J
authors.initials: CJ
authors.lastname: Green
authors.forename: Anthony S
authors.initials: AS
authors.lastname: Mee
mesh_terms: D000328:Adult; D000368:Aged; D001379:Azathioprine / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use; D003093:Colitis, Ulcerative / Q000188:drug therapy; D003424:Crohn Disease / Q000188:drug therapy; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use; D015212:Inflammatory Bowel Diseases / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D016896:Treatment Outcome
chemical_list: D007166:Immunosuppressive Agents; D001379:Azathioprine