Relations between psychotic symptoms and serum prolactin levels.

Constantly high prolactin values during treatment with neuroleptics at least contribute to the continuance of pathological psychic symptoms. Single-drug therapy should always be the aim in long-term treatment of chronic schizophrenic patients, gynaecological disorders should be recognised in time, and an adenoma of the pituitary should be considered in differential diagnosis if the prolactin levels are permanently increased.