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Allergy to hydroxycobalamin, with tolerance of cyanocobalamin

David Heyworth-Smith and Patrick G Hogan
Med J Aust 2002; 177 (3): 162-163.
Published online: 5 August 2002

To the Editor: Cyanocobalamin and hydroxycobalamin are synthetically derived preparations of vitamin B12. Allergy to vitamin B12 injection is infrequent, but may be serious. We describe a patient with allergy to hydroxycobalamin, without cross-reaction to cyanocobalamin.

  • David Heyworth-Smith
  • Patrick G Hogan



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