Can an ancient herbal capsule boost antidepressant power?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. In line with the diagnostic criteria for depression of Diagnostic and Statistical Manual of Mental Disorders (5th edition) (DSM-5); 2. Age: 18-65 (including 18 and 65), gender unlimited; 3. Hamilton Rating Scale for Depression (HAMD-17) score≥18 in the screening period, and the 13th score≥2; 4. For women of childbearing age, pregnancy test must be negative and not in lactation. The contraception measure must be accepted by the Investigators. Participants should agree to maintain this measure throughout the whole process; 5. Sign the informed consent form voluntarily and agree to participate in all visits, examinations and treatment as required by the trial protocol. Exclusion Criteria: 1. Treatment-resistant depression (patients with poor clinical efficacy of antidepressants with two or more different mechanisms after sufficient and full course of treatment); 2. Patients who meet DSM-5 diagnostic criteria for other mental disorders (such as schizophrenia pedigree and other mental disorders, bipolar and related disorders, anxiety disorders, obsessive-compulsive and related disorders, somatic symptoms and related disorders); 3. Depression caused by psychoactive drugs; 4. Patients with severe suicide (HAMD-17 suicide score≥3) and injury tendency; 5. Patients with serious or unstable cardiovascular, cerebrovascular, liver, kidney, endocrine, digestive and blood diseases; 6. Depressive episodes secondary to other mental diseases or somatic diseases at an active stage; 7. ALT and AST values in the liver function examination are more than double the upper limit of reference value, or Scr value is above the upper limit of reference value; 8. Patients with a history of endocrine diseases such as hyperthyroidism and hypothyroidism who are currently active; 9. Patients who had undergone psychiatric surgery or electroconvulsive therapy in the past three months; 10. Anyone with an allergic constitution known or suspected to have an allergic history to Hypericum perforatum L., Eleutherococcus senticosus and Fluoxetine; 11. Those who have previously failed Shuganjieyu capsule or Fluoxetine treatment; 12. Women in pregnancy or lactation period. Women who plan to get pregnant during the study and within six months; 13. Patients with psychoactive substance abuse or dependence in the past 12 months; 14. Long-term use of caffeine and nicotine; 15. Patients who have received or are receiving any other clinical trial drug treatment within three months before the trial; 16. Patients who are taking drugs that interfere with the efficacy evaluation of the investigational drugs, and drugs that are forbidden to be used in combination with the test drugs. Patients who have received antidepressant drugs for systematical treatment within 4 weeks; 17. Those who are regarded as unsuitable by investigators for this clinical trial.