Herbal Medicines (Danggui Liuhuang Decoctions) for Management of Menopausal Symptoms: A Systematic Review of Randomized Controlled Trials

Danggui Liuhuang (DLH) decoctions are traditional herbal medicines that are widely used for menopausal symptoms. The objective of this systematic review was to investigate evidence of the efficacy of DLH decoctions for menopausal symptoms. Fifteen databases were searched from inception until 29 May, 2020. We included randomized controlled trials (RCTs) testing any type of DLH decoction. All RCTs investigating DLH decoctions or modified DLH decoctions were included. The methodological quality of the RCTs was evaluated using Cochrane’s risk of bias assessment tool. We measured the certainty of evidence (CoE) according to the GRADE approach. A total of five RCTs met all of the inclusion criteria and were analyzed. The included RCTs had unclear risks of bias in most domains. Based on studies using the Kupperman index for the measurement of menopausal symptoms, DLH decoctions may have ameliorative effects on menopausal symptoms equivalent to those of conventional drug therapies, but we are very uncertain (MD 3.03, 95% CI −3.17 to 9.25, two studies, very low CoE). Compared with conventional drug therapies, DLH decoctions may reduce hot flashes (MD 0.17, 95% CI 0.28 to 0.06, three studies, low CoE). The difference in the response rate between treatments is very uncertain (risk ratio 1.1, 95% CI 1.07 to 1.25, three studies, very low CoE); the results may indicate that compared with drug therapy, DLH decoction therapy elicits responses in 84 more cases per 1000 cases. In conclusion, there is limited evidence that DLH decoctions improve menopausal symptoms equivalently compared with conventional drug therapies. However, the studies had unclear risks of bias, and the CoEs were very low in general. Additional large and rigorous studies are needed.