The British Journal of Psychiatry 139: 408-412 (1981)
© 1981 The Royal College of Psychiatrists
Neuroendocrine tests during treatment with neuroleptic drugs. III. Plasma growth hormone and prolactin responses to apomorphine
T Kolakowska, M Gelder and S Fraser
Hormonal responses to apomorphine 0.005 and/or 0.01 mg/kg body weight were
studied in 17 schizophrenic patients during their routine treatment with
neuroleptic drugs. Plasma growth hormone (GH) rose in 9 of the 20 tests and
in 4 of these GH peak exceeded 5 ng/ml. This preserved GH response to
apomorphine was significantly but weakly associated with lower daily doses
of neuroleptics. It was unrelated to the extrapyramidal side-effects,
plasma prolactin (PRL) level, duration of treatment or its therapeutic
effect. In 13 of the 20 tests, plasma PRL declined by more than 20 per cent
of the baseline level. This was similar to the fall in PRL observed after
placebo in the group studied previously. The absolute decline in plasma PRL
following apomorphine correlated positively with the baseline PRL
concentration and was unrelated to the daily doses of neuroleptics or to
any other variable considered.