title: Long versus short course treatment with Metformin and Clomiphene Citrate for ovulation induction in women with PCOS.
abstract: BACKGROUND
  Polycystic ovary syndrome (PCOS) is the most common endocrinopathy among reproductive-aged women. Apart from infertility, women with PCOS often have other endocrine disorders, including insulin resistance,hyperinsulinaemia and hyperandrogenism. Metformin,combined with clomiphene citrate (CC), has been shown to be more effective in ovulation induction when compared with clomiphene citrate alone. The optimal duration for metformin pretreatment before initiation of clomiphene citrate, however, is unknown.
  
  
  OBJECTIVE
  To determine the effectiveness of short-course (less than four weeks) metformin plus CC versus long-course (four weeks or more) metformin plus CC with regard to ovulation and achievement of pregnancy in infertile PCOS women.
  
  
  METHODS
  We searched the Cochrane Menstrual Disorders and Subfertility Group Trials Register (December 2006), the Cochrane Central Register of Controlled Trials (The Cochrane Library 2006, 2006 issue 4), MEDLINE (1950 to 7 January 2007), CINAHL (1982 to December 2006) and EMBASE (1980 to 7 January 2007).
  
  
  METHODS
  Randomised controlled trials comparing short-course (less than four weeks) metformin plus CC versus long-course (four weeks or more) metformin plus CC for ovulation or achievement of pregnancy in infertile PCOS women.
  
  
  METHODS
  No trials were found that met the selection criteria.
  
  
  RESULTS
  No randomised controlled trials were identified.
  
  
  CONCLUSIONS
  There are insufficient data to determine whether short-chouse metformin pretreatment is as effective as the conventional long-course metformin pretreatment before initiation of clomiphene citrate for ovulation induction in infertile PCOS patients. A well-designed randomised controlled trial is needed to answer this important clinical question.
authors.affiliation: Khon Kaen Universtity, Obstetrics and Gynaecology, Kohn Kaen, Thailand, 40002. sisupat@kku.ac.th
authors.forename: S
authors.initials: S
authors.lastname: Sinawat
authors.forename: P
authors.initials: P
authors.lastname: Buppasiri
authors.forename: P
authors.initials: P
authors.lastname: Lumbiganon
authors.forename: P
authors.initials: P
authors.lastname: Pattanittum
mesh_terms: D002996:Clomiphene / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D004359:Drug Therapy, Combination; D005260:Female; D005300:Fertility Agents, Female / Q000008:administration & dosage*; D006801:Humans; D007247:Infertility, Female / Q000188:drug therapy; D008687:Metformin / Q000008:administration & dosage*; D010062:Ovulation Induction / Q000379:methods*; D011085:Polycystic Ovary Syndrome / Q000150:complications*
chemical_list: D005300:Fertility Agents, Female; D002996:Clomiphene; D008687:Metformin