In vitro activity: Iloperidone displays high affinity (Ki < 10 nM) for norepinephrine alpha(1)-adrenoceptors, dopamine D(3) and serotonin 5-HT(2A) receptors. Iloperidone displays higher affinity for the dopamine D3 receptor (Ki = 7.1 nM) than for the dopamine D4 receptor (Ki = 25 nM). Iloperidone displays high affinity for the 5-HT6 and 5-HT7 receptors (Ki = 42.7 nM and 21.6 nM, respectively), and is found to have higher affinity for the 5-HT2A (Ki = 5.6 nM) than for the 5-HT2C receptor (Ki = 42.8 nM). Iloperidone significantly increases dopa accumulation, an index of dopamine turnover in response to D2 receptor blockade, at doses from 0.3 mg/kg to 10 mg/kg i.p. in the striatum and from 1 mg/kg to 10 mg/kg in the nucleus accumbens.

Kinase Assay: Iloperidone(HP 873) is a D2/5-HT2 receptor antagonist, which is an atypical antipsychotic for the treatment of schizophrenia symptoms. Iloperidone displayed higher affinity for the dopamine D3 receptor (Ki = 7.1 nM) than for the dopamine D4 receptor (Ki = 25 nM). Iloperidone displayed high affinity for the 5-HT6 and 5-HT7 receptors (Ki = 42.7 and 21.6 nM, respectively), and was found to have higher affinity for the 5-HT2A (Ki = 5.6 nM) than for the 5-HT2C receptor (Ki = 42.8 nM).