Article: PDF OnlyBuchman Nili; Mendelsson, Erica; Lerner, Vladimir; Kotler, MosheClinical Neuropharmacology: November-December 1999 - p 356-358 Buy Abstract Summary A case is presented of a 65-year-old man with chronic schizophrenia who, after tour 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 folie acid. This case emphasizes the need to measure vitamin BI2 in psyehogeriatric patients, especially when they present with a severe infection and organic mental symptoms. © 1999 Lippincott Williams & Wilkins, Inc.