Si-Ni-San reduces the release of inflammatory factors IL-1β, IL-6, IL-2, and TNF-α in the peripheral fluid of patients with post-stroke depression and regulates the over-activation of the HPA axis, thereby exerting an antidepressant effect (Guo et al., 2009; Li et al., 2013). This evidence concerns the gene IL6 and depressive symptom measurement.