I took Dostinex years ago because my prolactin was elevated (about 80....normal is around up to 12). It worked and after a year or so of taking it, my levels remained normal. Unfortunately, something is still screwed up as my Testosterone level is around 100 without Androgel or HCG shots.
I never noticed any side effects. Interestingly, however, even when my Testosterone level was at 100, I had no issues with sex, erections, etc.