Eligibility Criteria:
Inclusion Criteria:
1. Meet the Rome IV diagnostic criteria for diarrhea-predominant irritable bowel syndrome;
2. Aged between 18 and 65 years old (inclusive), male or female;
3. HAMA assessment ≥ 14 points or HAMD assessment ≥ 17 points
Exclusion Criteria:
1. Patients with severe cardiovascular and cerebrovascular diseases (such as myocardial infarction, cerebral infarction, coronary heart disease, etc.);
2. Abnormal liver and kidney function (ALT or AST \> 1.5 times the upper limit of normal, or T-Bil \> 1.5 times the upper limit of normal, or Cr more than the upper limit of normal), hematopoietic system diseases and tumors;
3. Patients with a history of abdominal surgery (except appendectomy and cholecystectomy);
4. Previous diagnosis of organic diseases of the digestive system, such as inflammatory bowel disease, intestinal tuberculosis, etc., or still associated with peptic ulcer, infectious diarrhea, etc.;
5. Previous diagnosis of diseases similar to irritable bowel syndrome symptoms, such as eosinophilic enteritis, microscopic colitis (including collagen colitis and lymphocytic colitis), lactose intolerance, malabsorption syndrome;
6. Previous diagnosis of non-intestinal digestive system diseases, such as tuberculous peritonitis, gallstones, cirrhosis, chronic pancreatitis;
7. Previous diagnosis of diseases affecting the digestive tract function, such as hyperthyroidism or hypothyroidism, endometriosis, autoimmune diseases, diabetes, etc.;
8. 4\. Patients who have taken drugs with bleeding risk or increased bleeding risk before treatment;
9. 4\. Patients who have taken antidepressant drugs and psychotropic drugs before treatment;
10. 4\. Use drugs that affect gastrointestinal motility and function, such as prokinetic drugs, anticholinergic drugs, calcium channel blockers, 5-HT receptor agonists/antagonists, antidiarrheal agents, antacids, intestinal bacteria modulators and antibiotics;
11. Allergic constitution;
12. Pregnant and lactating women; Others that may affect study compliance or adversely affect the results as judged by the investigator.