title: Chinese herbal medicine modified xiaoyao san for functional dyspepsia: meta-analysis of randomized controlled trials.
abstract: BACKGROUND
  To critically assess the evidence of modified xiaoyao san (MXS) for treating functional dyspepsia (FD).
  
  
  METHODS
  Systematic literature searches were carried out on the Medline database, CNKI database, Wanfang Data, VIP Information and the Cochrane Library. Reference lists located were checked for further relevant publications. Experts in the field and manufacturers of identified products were contacted for unpublished material. Studies were selected according to predefined inclusion and exclusion criteria. All randomized clinical trials of MXS for treating FD were included. Study selection, data extraction and validation were carried out by at least two reviewers with disagreements being settled by discussion. Weighted means and 95% confidence intervals were calculated and sensitivity analyses were carried out.
  
  
  RESULTS
  Thirty-three potentially relevant articles were retrieved for further evaluation. Fourteen were suitable for inclusion in the meta-analysis. There was evidence that MXS compared with prokinetic drugs reduced symptoms (odds ratio 3.26, 95% CI 2.24 to 4. 47). There was evidence that MXS + prokinetic drugs compared with prokinetic drugs reduced symptoms (odds ratio 4.32, 95% CI 2.64 to 7.08).
  
  
  CONCLUSIONS
  MXS appears to be more effective compared to prokinetic drugs in the treatment of FD and no serious side-effects were identified. However, the evidence remains weak due to publication bias and methodological flaws, which may amplify the therapeutic benefit of MXS.
authors.affiliation: Laboratory of Ethnopharmacology and Institute of Integrated Traditional Chinese and Western Medicine, Xiangya Hospital, Central South University, Changsha, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Qin
authors.forename: Xi
authors.initials: X
authors.lastname: Huang
authors.forename: Ping
authors.initials: P
authors.lastname: Ren
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004365:Drugs, Chinese Herbal / Q000009:adverse effects / Q000627:therapeutic use*; D004415:Dyspepsia / Q000188:drug therapy* / Q000503:physiopathology; D019317:Evidence-Based Medicine; D005260:Female; D005765:Gastrointestinal Agents / Q000009:adverse effects / Q000627:therapeutic use*; D005769:Gastrointestinal Motility / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D004365:Drugs, Chinese Herbal; D005765:Gastrointestinal Agents; C532268:xiaoyaosan