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“Furthermore, caffeine potentiates the effects of dopamine-mediated drugs on these same behaviors, and some of caffeine's effects on these behaviors can be blocked by dopamine receptor antagonists.”
Pharmacology Biochemistry and Behavior • 1997 | View Paper
“Thus, caffeine produces differential cross tolerance to the amphetamine-like discriminative effects of dopaminergic drugs , a phenomenon in which the dopamine D(1) receptor appears to have an important role.”