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hyperprolactinaemia (hy-per-proh-lak-tin-ee-miă) n. raised serum levels of prolactin, usually due to the presence of a benign pituitary tumour (see prolactinoma); other causes include dopamine receptor antagonists (e.g. antipsychotic drugs) and chronic renal failure. Symptoms include loss of sexual drive, amenorrhoea or impotence, and secretion of breast milk in both women and men.