Introduction: The aim of this systematic review is to analyse trial data on the effectiveness of a herbal medicine (Gan Mai Da Zao (GMDZ) decoction) in treating depression.
Methods and analysis: 12 databases will be searched from their inception: PubMed, EMBASE, AMED, the Cochrane Library, five Korean medical databases (KoreaMed, DBpia, OASIS, the Research Information Service System (RISS) and the Korean Studies Information Service System (KISS)) and three Chinese medical databases (China National Knowledge Infrastructure (CNKI), the Wanfang Database and the Chinese Scientific Journals Database (VIP)). Randomised clinical trials (RCTs) or quasi-RCTs using a GMDZ decoction for any type of depression will be considered. The selection of the studies, data abstraction and validations will be performed independently by two researchers.
Dissemination: The findings will be disseminated to appropriate audiences via peer-reviewed publication and conference presentations.
Trial registration number: PROSPERO 2013:CRD42013005100.
Keywords: COMPLEMENTARY MEDICINE; MENTAL HEALTH.