title: Hypersensitivity reactions associated with 5- hydroxytryptamine(3)-receptor antagonists: a class effect?
abstract: BACKGROUND
  The 5-hydroxytryptamine(3) (5-HT(3))- receptor antagonists, granisetron, ondansetron, and tropisetron are effective anti-emetic medications for use during chemotherapy for cancer and they are generally well tolerated. Their adverse event profiles broadly overlap and include headache and gastrointestinal symptoms, especially constipation. Hypersensitivity reactions have been reported very rarely.
  
  
  METHODS
  We describe two patients who developed severe hypersensitivity reactions following exposure to a 5- HT(3) receptor antagonist after having experienced mild to moderate hypersensitivity symptoms following previous exposure to a different 5-HT(3) receptor antagonist.
  
  
  RESULTS
  A literature search on hypersensitivity reactions associated with these drugs suggests that these are the first reported instances of cross-reactive hypersensitivity.
  
  
  CONCLUSIONS
  There may be a drug class effect, and we caution against switching to another 5-HT(3) receptor antagonist in patients who have suffered even mild hypersensitivity reactions during previous therapy with 5- HT(3) receptor antagonist.
authors.affiliation: Department of Oncology, University Hospital, Kuopio, Finland.
authors.forename: V
authors.initials: V
authors.lastname: Kataja
authors.forename: K M
authors.initials: KM
authors.lastname: de Bruijn
mesh_terms: D000368:Aged; D000932:Antiemetics / Q000009:adverse effects*; D004342:Drug Hypersensitivity / Q000209:etiology*; D005260:Female; D017829:Granisetron / Q000009:adverse effects*; D006801:Humans; D007211:Indoles / Q000009:adverse effects*; D008875:Middle Aged; D017294:Ondansetron / Q000009:adverse effects*; D012702:Serotonin Antagonists / Q000009:adverse effects*; D000077526:Tropisetron
chemical_list: D000932:Antiemetics; D017829:Granisetron; D007211:Indoles; D017294:Ondansetron; D012702:Serotonin Antagonists; D000077526:Tropisetron