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The sterical requirements of dopamine (DA) receptors involved in the control of prolactin (PL) secretion have been analyzed by studying the effects of the administration of d- and l-sulpiride (25 mg i.v.) on PL serum levels in five normal male volunteers. Both d- and l-sulpiride cause a remarkable rise in PL serum levels, the only difference between the two drugs being the lower decay rate of hormone levels after the l-isomer. The results obtained are discussed in the frame of a possible low steric selectivity of DA receptors controlling PL secretion in the hyposthalamo-pituitary axis.
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