• Supat Sinawat, Pranom Buppasiri, Pisake Lumbiganon, and Porjai Pattanittum.
• Department of Physiology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand. sisupat@kku.ac.th
• Cochrane Db Syst Rev. 2012 Oct 17; 10 (10): CD006226CD006226.

BackgroundPolycystic 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.ObjectivesTo 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 women with PCOS.Search MethodsWe searched the Cochrane Menstrual Disorders and Subfertility Group Trials Register, the Cochrane Central Register of Controlled Trials, MEDLINE, CINAHL, EMBASE and PsycINFO (all from inception to 1 February 2012).Selection CriteriaRandomised 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 women with PCOS.Data Collection And AnalysisNo trials were found that met the selection criteria.Main ResultsNo randomised controlled trials were identified.Authors' ConclusionsThere are insufficient data to determine whether short-course metformin pretreatment is as effective as the conventional long-course metformin pretreatment before initiation of clomiphene citrate for ovulation induction in infertile women with PCOS. A well-designed randomised controlled trial is needed to answer this important clinical question.

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