Description
SCH 39166 is a dopamine D
1 receptor antagonist (K
i = 5 nM). It is selective for D
1 over D
2-4 receptors (K
is = 3,751, >1,000, and 5,934 nM, respectively), however, it also binds to D
5 receptors (K
i = 4.4 nM). SCH 39166 inhibits food intake in a dose-dependent manner in rats (ED
50 = 0.84 mg/kg). It reduces ethanol intake in Sardinian alcohol-preferring rats and sucrose intake in water-deprived and water-sated rats without affecting food or total fluid intake. SCH 39166 also suppresses cocaine-induced arrhythmias in anesthetized dogs.