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“Prior application of dopamine or spiperone , a selective dopamine D2‐like antagonist, blocked the above effects of melatonin and luzindole, respectively.”
The Journal of pharmacology and experimental therapeutics • 2000 | View Paper
“ Spiroperidol , clozapine, haloperidol and sulpiride significantly increased melatonin content in the light-exposed retina, but had no effect on the activity of hydroxyindole-O-methyltransferase.”