Extract of Ginkgo biloba (EGb) plus haloperidol v placebo plus haloperidol for refractory schizophrenia†

Outcome at 12 weeksEGb + haloperidolPlacebo + haloperidolRBI (95% CI)NNT (CI)
†Clinical response ≥30% decrease in score on the Scale for the Assessment of Positive Symptoms. Other abbreviations defined in glossary; RBI, NNT, and CI calculated from data in article.
Clinical response57%38%51% (0.56 to 37)6 (3 to 179)