Hyperprolactinaemia in men-response to bromocriptine therapy.

Men with hyperprolactinaemia present with large tumours. Conventional therapy with surgery and/or irradiation is unsatisfactory, with up to 100% of patients remaining hyperprolactinaemic (or subsequently developing pituitary insufficiency). In view of reports of bromocriptine-induced regression of prolactinomas, eight consecutive male hyperprolactinaemic patients with impotence and/or symptoms related to local tumour effects were treated with bromocriptine 20 mg daily as sole therapy for 3-11 months. Symptoms were relieved partly or completely in seven patients and serum prolactin was restored to normal or near normal in all men. Serum thyroxine and plasma cortisol response to hypoglycaemia became normal in two men who had subnormal values before therapy. Mean serum growth hormone response to hypoglycaemia rose significantly as did plasma testosterone concentrations. Evidence of tumour regression, sometimes massive, was seen in the six patients who underwent repeat radiology. The symptomatic relief and biochemical and radiological improvement in these patients indicate that bromocriptine therapy may now be the treatment of choice for hyperprolactinaemic men with large tumours.