Daledalin is a norepinephrine reuptake inhibitor, developed in the 1970s by Pfizer. In animal models, daledalin potentiates the action of catecholamines, reverses the hypothermia induced by noradrenaline or noradnamine injected into the cerebral ventricles of mice. Daledalin potentiates amphetamine-induced excitation in rats and antagonizes reserpine-hypothermia in mice, tetrabenazine-sedation in rats and reserpine- and tetrabenazine-induced ptosis in mice. It inhibits noradrenaline and 5-hydroxytryptamine uptake by rat brain slices in vitro. In a clinical trial on patients with a depressive illness, no difference in efficacy between daledalin and amitriptyline was found.