Delirium associated with vitamin B12 deficiency after pneumonia

Nili Buchman, Erica Mendelsson, Vladimir Lerner, Moshe Kotler

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


A case is presented of a 65-year-old man with chronic schizophrenia who, after four years of remission, developed psychotic symptoms after pneumonia. The patient was found to be deficient in vitamin B12. His psychosis remitted within 5 days of administration of vitamin B12 and folic acid. This case emphasizes the need to measure vitamin B12 in psychogeriatric patients, especially when they present with a severe infection and organic mental symptoms.

Original languageEnglish
Pages (from-to)356-358
Number of pages3
JournalClinical Neuropharmacology
Issue number6
StatePublished - 1 Nov 1999


  • Deficiency
  • Delirium
  • Pneumonia
  • Vitamin B12


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