B-HT 920 (2-amino-6-allyl-5,6,7,8-tetrahydro-4H-thiazolo-[4,5-d]-azepine), an alpha 2-adrenoceptor agonist has been reported to modulate dopamine (DA) receptor activity. Earlier studies speculated the DA autoreceptor action of B-HT 920. However, some recent studies have indicated that the stimulatory effects of B-HT 920 are sensitive to blockade by sulpiride and haloperidol, suggesting a postsynaptic D2-dopamine receptor action. The article briefly reviews the current concepts about DAergic actions of B-HT 920.