Treatment of prolactin-secreting macroadenomas with the once-weekly dopamine agonist cabergoline

The Journal of Clinical Endocrinology and Metabolism
B M BillerA Klibanski

Abstract

Dopamine agonist administration is the primary therapy for macroprolactinomas, but bromocriptine is the only agent approved in the United States. Its use is limited by a high incidence of side effects, a short duration of action, and a lack of effectiveness in some patients. Cabergoline is a long-acting dopamine agonist specific for the D2 receptor that is more effective and better tolerated than bromocriptine in women with microadenomas or idiopathic hyperprolactinemia. However, experience with cabergoline in the treatment of patients with macroadenomas is limited. We report the first study of chronic administration of cabergoline conducted exclusively in patients with macroprolactinomas. Fifteen patients (8 women, 7 men) ages 18-76 yr were studied in an open-label 48-week dose escalation trial of cabergoline administered once per week. Eleven patients had received prior therapy with other dopamine agonists. Mean prolactin (PRL) levels decreased by 93.6%, and normal levels were attained in 73% of patients at doses of 0.5-3.0 mg per week. Three of five patients who had failed to normalize PRL on prior dopamine agonists achieved normal levels. Gonadal function was restored in all hypogonadal men and in 75% of premenopausal women...Continue Reading

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