Perphenazine dihydrochloride is an orally active dopamine receptor and histamine-1 receptor antagonist that acts on D2 (Ki: 0.56 nM), D3 (Ki: 0.43 nM), and 5-HT2A (Ki: 0.6 nM) receptors, and also binds Alpha-1A adrenergic receptors. It can induce apoptosis, inhibit cancer cell proliferation, and is used to study psychiatric disorders, cancer, and inflammation.