They have no affinity with a large number of neurotransmitter receptors, including serotonergic (5-HT1, 5-HT1A, 5-HT1B, 5-HT2A, 5-HT2C), adrenergic (β 1, β 2, β 3, α 1, α 2), dopaminergic (D1-like, D2-like), muscarinic, histaminergic (H1), benzodiazepine and NMDA receptors.