Cabergoline plus metformin therapy effects on menstrual irregularity and androgen system in polycystic ovary syndrome women with hyperprolactinemia

Background: 30% of patients with polycystic ovary syndrome (PCOS) show mild, transient hyperprolactinemia. It is suggested that a reduction of the dopamine inhibitory effect might raise both prolactin and luteinizing hormone. Objective: To investigate the adjuvant cabergoline therapy effects on menstrual irregularity and androgen system in PCOS women with hyperprolactinemia. Materials and Methods: This randomized clinical trial was done on 110 polycystic ovary syndrome women with increased serum prolactin concentration [1.5 fold more than normal level (>37.5 ng/ml)]. Participants were divided into two groups: Case group (n=55) treated with metformin 1gr/day and cabergoline 0.5 mg/week for 4 months and control group (n=55) treated with metformin 1g/day and placebo weekly. Testosterone, prolactin, and dehydroepiandrosterone sulfate level were measured before and four months after intervention in two groups. Also, situation of menstrual cycles asked and recorded before and after intervention. Results: We found decrease in the mean of dehydroepiandrosterone sulfate, weight and total testosterone level in the two groups after intervention but their changes were not significant. Patients in case group showed a significant decrease in serum prolactin level before and after intervention (p