Effects of bupropion on core body temperature of mice.

The effects of bupropion on core body temperature of intact or reserpinized mice were studied. Intraperitoneal (IP) administration of bupropion to mice induced a dose-dependent hypothermia. The response of bupropion was decreased by the D-2 antagonist sulpiride or pimozide, but not by the D-1 antagonist SCH 23390, antimuscarinic drug atropine, alpha-adrenergic blocker phenoxybenzimine, beta-adrenergic antagonist propranolol or antiserotonergic methergoline. Reserpine induced hypothermia, which was reversed by bupropion administration. The reversal response of bupropion was reduced by propranolol, but not sulpiride, SCH 23390, phenoxybenzamine, atropine or methergoline. It is concluded that bupropion-induced hypothermia may be mediated through D-2 receptor activation, while the reversal of reserpine-induced hypothermia by bupropion may be exerted through beta-adrenergic stimulation.