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The effects of the selective 5‐HT 2 receptor antagonist, ritanserin, on the growth hormone (GH) and prolactin (PRL) responses to intravenous L‐tryptophan (LTP) were assessed in 8 normal volunteers. Administration of ritanserin (40 mg orally) prior to infusion of LTP (5 g) significantly enhanced the PRL responses but not those of GH. The results are consistent with previous proposals that the endocrine responses to LTP are mediated by 5‐HT 1 rather than 5‐HT 2 receptors and also suggest that 5‐HT 2 receptor antagonists may increase certain 5‐HT 1 mediated responses in the human brain. Copyright © 1986 John Wiley & Sons, Ltd.

Original publication




Journal article


Human Psychopharmacology: Clinical and Experimental

Publication Date





93 - 97