Vitamin B(6) in the treatment of tardive dyskinesia: a double-blind, placebo-controlled, crossover study

Am J Psychiatry. 2001 Sep;158(9):1511-4. doi: 10.1176/appi.ajp.158.9.1511.


Objective: The authors' goal was to conduct a double-blind trial of vitamin B(6) in the treatment of tardive dyskinesia in patients with schizophrenia.

Method: Fifteen inpatients with schizophrenia who met research diagnostic criteria for tardive dyskinesia were randomly assigned to treatment with either vitamin B(6) or placebo for 4 weeks in a double-blind crossover paradigm. The Extrapyramidal Symptom Rating Scale was used to assess patients weekly.

Results: Mean scores on the parkinsonism and dyskinetic movement subscales of the Extrapyramidal Symptom Rating Scale were significantly better in the third week of treatment with vitamin B(6) than during the placebo period.

Conclusions: Vitamin B(6) appears to be effective in reducing symptoms of tardive dyskinesia.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Aged
  • Cross-Over Studies
  • Double-Blind Method
  • Dyskinesia, Drug-Induced / drug therapy*
  • Dyskinesia, Drug-Induced / etiology
  • Female
  • Hospitalization
  • Humans
  • Male
  • Middle Aged
  • Placebos
  • Psychotic Disorders / drug therapy
  • Psychotropic Drugs / adverse effects*
  • Psychotropic Drugs / therapeutic use
  • Pyridoxine / therapeutic use*
  • Schizophrenia / drug therapy
  • Treatment Outcome


  • Placebos
  • Psychotropic Drugs
  • Pyridoxine