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Szewczak, M.R. et al.

The pharmacological profile of iloperidone, a novel atypical antipsychotic agent.

Iloperidone (1-[4-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1- piperidinyl]propoxy]-3-methoxyphenyl]ethanone) demonstrated a potent antipsychotic profile in several in vitro and in vivo animal models. Iloperidone displaced ligand binding at D2 dopamine receptors (IC50 = 0.11 microM) and displayed a high affinity for serotonin (5-HT2) receptors (IC50 = 0.011 microM) and alpha-1 receptors (IC50 = 0.00037 microM). In vivo, iloperidone antagonized apomorphine-induced climbing behavior in mice at low doses with good oral bioavailability, prevented 5-HT-induced head twitch in rats at low doses, and inhibited self-stimulation behavior in rats, pole climb avoidance in rats and continuous Sidman avoidance responding in monkeys. The latter assay also demonstrated a good duration of action. Iloperidone was substantially less active in models of extrapyramidal side effect (EPS) liability, such as preventing apomorphine-induced stereotypy and causing catalepsy in rats. In single dopamine neuron sampling studies, iloperidone demonstrated clozapine-like effects on the number of active midbrain dopamine neurons. Based on the significant increase in the open arm time seen after iloperidone treatment in the elevated plus maze assay and increased interaction score in social interaction, iloperidone may also have favorable effects in the clinic on anxiety and, possibly, negative symptoms. Clinical trials are under way of the use of iloperidone for the treatment of schizophrenia.[1]

References

The pharmacological profile of iloperidone, a novel atypical antipsychotic agent. Szewczak, M.R., Corbett, R., Rush, D.K., Wilmot, C.A., Conway, P.G., Strupczewski, J.T., Cornfeldt, M. J. Pharmacol. Exp. Ther. (1995) [Pubmed]

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