Effectiveness and tolerability of warm-supplementing kidney yang added to risperidone in improving cognitive impairment in patients with schizophrenia: An 8-week, multicenter, randomized, double-blind, placebo-controlled clinical trial.

Background: Certain herbal medicines have been reported to be effective in the treatment of psychiatric conditions, and combination treatment with drugs and herbal medicines has been reported to be useful in enhancing treatment efficacy and reducing recovery time and adverse events (AEs).

Objective: The purpose of this study was to investigate the effectiveness and tolerability of warm-supplementing kidney yang (WSKY) added to risperidone in improving cognitive impairment and negative symptoms (ie, cognitive function) in patients with schizophrenia.

Methods: This 8-week, multicenter, randomized, double-blind, placebo-controlled clinical trial was conducted in patients who met the clinical classification for schizophrenia according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision.