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The effect of 100 mg im sulpiride on plasma Prl levels was studied in 10 normal females, 21 patients with galactorrhoea and normal plasma Prl, 10 women with puerperal hyperprolactinaemia and 27 patients with amenorrhoea-galactorrhoea and high plasma Prl levels. The response to sulpiride in patients with galactorrhoea but normal Prl was slightly higher (P < 0.05) than that observed in normal women, but only if expressed in per cent. Women with puerperal hyperprolactinaemia respond to the drug with a marked increase in Prl (mean ± sem: 563.0 ± 142.8%), even though their baseline values are already very high (mean ± sem: 133.6 ± 23.8 ng/ml). By contrast, there is a lower or no response to sulpiride in 13 women with pituitary tumour. The same was true in 11 patients with hyperprolactinaemia of uncertain aetiology but also 10 of these subjects presented signs suggestive of a tumour. In the last 3 patients with pathological hyperprolactinaemia in whom a consistent Prl increase after sulpiride was observed, hyperprolactinaemia was probably not of tumourous origin. On the basis of these results, the sulpiride test appears promising for discriminating between organic and 'functional' cases of enhanced Prl secretion.