Objective: The aim of this study was to compare the effectiveness of myo-inositol (MYO) and metformin, in monotherapy or in association with recombinant follicle stimulating hormone (r-FSH), in the treatment of menstrual irregularities, chronic anovulation, and female infertility in patients with polycystic ovary syndrome (PCOS).
Materials and methods: One hundred twenty patients were randomly treated with metformin 1500 mg/day orally (n = 60), or 4 g MYO plus 400 microg folic acid daily (n = 60), continuously. If no pregnancy occurred, r-FSH (37.5 units/day) was added to the treatment for a maximum of three attempts.
Results: Fifty percent of the patients who assumed metformin restored spontaneous ovulation, 18.3% of these obtained pregnancy. The remaining 42 patients were treated with metformin plus r-FSH. Pregnancy occurred in a total of 11 women (26.1%). The total pregnancy rate was 36.6%. Sixty-five percent of the patients treated with MYO plus folic acid restored spontaneous ovulation activity, 30% of these obtained pregnancy. The remaining 38 patients were treated with MYO, folic acid plus r-FSH. Pregnancy occurred in a total of 11 women (28.9%). The total pregnancy rate was 48.4%.
Conclusions: Both metformin and MYO, can be considered as first line treatment for restoring normal menstrual cycles in most patients with PCOS, even if MYO treatment seems to be more effective than metformin.