Anaphylactic reaction to vitamin B12 appearing after several years of therapy.
D000368:Aged; D000707:Anaphylaxis / Q000139:chemically induced*; D000752:Anemia, Pernicious / Q000188:drug therapy; D004342:Drug Hypersensitivity / Q000209:etiology*; D005260:Female; D006801:Humans; D007273:Injections, Intramuscular; D014805:Vitamin B 12 / Q000008:administration & dosage / Q000009:adverse effects*
D014805:Vitamin B 12