Anaphylactic reaction after intramuscular injection of cyanocobalamin (vitamin B12): A case report

Fareena Bilwani, Salman N. Adil, Usman Sheikh, Ayesha Humera, Mohammad Khurshid

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We report a case of anaphylactic reaction to intramuscular injection of cyanocobalamin. This 52-year-old lady was diagnosed as a case of megaloblastic anemia secondary to dietary vitamin B12 deficiency. She had severe anaphylactic reaction after the parenteral administration of cyanocobalamine. Later she received oral vitamin B12 with no adverse effects. The purpose of this case report is to draw attention to the hypersensitive reaction to injectable vitamin B12, which is rarely seen. This could be due to sensitization to the vitamin B12 molecule itself or an IgE mediated reaction. We concluded that anaphylactic reaction to vitamin B12 is a rare but serious side effect and it should be kept in mind while the drug is being administered to the patient, especially via the parenteral route.

Original languageEnglish
Pages (from-to)217-219
Number of pages3
JournalJournal of the Pakistan Medical Association
Volume55
Issue number5
Publication statusPublished - May 2005

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