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Kelly PH, Iversen LL. 
“LSD as an Agonist at Mesolimbic Dopamine Receptors”. 
Psychopharmacologia. 1975;45:221-224.
The dopamine agonist apomorphine (1.0 mg/kg i.p.) produced an enyhanced stimulation of locomotor activity compared to control animals in rats injected bilaterally 14 days previously with 6-hydroxydopamine (6OHDA) into the nucleus accumbens. (+)-Lysergic acid diethylamide (LSD) also produced a marked stimulation of locomotor activity in the 6OHDA treated animals at a dose (1.0 mg/kg i.p.) which was ineffective in control rats. (+)-Bromo-lysergic acid diethylamide (2.0 mg/kg i.p.) did not stimulate locomotor activity in 6OHDA treated rats. The locomotor stimulaiton produced by LSD was blocked by pretreatment with the dopamine antagonist pimozide (0.5 mg/kg i.p.). It is suggested that LSD acts as an agonist at mesolimbic receptors.
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