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Effect of bromocriptine and metergoline in the treatment of hyperprolactinaemic states.

The effects of bromocriptine or metergoline treatment were evaluated in 80 hyperprolactinaemic patients (62 women and 18 men). The patients were subdivided into 4 groups: group A) 16 women with idiopathic hyperprolactinaemia; group B) 19 women with untreated Prl-secreting microadenomas; group C) 27 women with unsuccessfully operated prolactinomas; group D) 18 men with unsuccessfully treated macroprolactinomas. Sixty-eight patients were given bromocriptine (2.5-20 mg/day) for 3-58 months and 33 patients were given metergoline (4-16 mg/day) for 3-19 months. Bromocriptine and metergoline were equally effective in the treatment of functional hyperprolactinaemia and of untreated microadenomas, while bromocriptine showed a more potent Prl-lowering effect than metergoline in patients with higher Prl levels and large prolactinomas; both drugs restored the gonadal function to a similar extent, though metergoline was effective in some cases, even in the absence of full Prl suppression. Bromocriptine seems to exert an antitumoral effect, as documented by CT scan in some patients with macroadenomas, but the precise role of both drugs with respect to dose, length of treatment and effectiveness after withdrawal needs to be evaluated further.