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 Olanzapine (2-methyl-4-(4-methylpiperazin-1-yl)-10H-thieno [2, 3-b][1, 5]benzodiazepine) is an antipsychotic drug with poor water-solubility that has a suitable affinity to some receptors. This benzodiazepine derivative is a new (atypical) antipsychotic drug and has a wide range of efficacy, especially in treatment of patients with negative psychiatric symptoms of schizophrenia. Olanzapine is used in psychotic disorders, mood disorders, and acute restlessness in bipolar patients. Its oral absorption is low and about 40% of the drug is metabolized in first-pass hepatic metabolism. This drug has low permeability into the brain related to remove by p-glycoprotein efflux and blood-brain-barrier (BBB) existence. Emerging nanotechnology during recent years demonstrated the tremendous ability of nanoparticles as versatile nanocarrier systems. This emerging technology has raised promising attempts to address the significant impact on decreasing side effects of drugs and their associated defects. Olanzapine can be administrated by different routes. Intranasal delivery of olanzapine to the brain due to lack of blood-brain-barrier in the olfactory system has facilitated its delivery. In this review article, several olanzapine nano-drug delivery systems are listed by reviewing their results, including nanosuspensions, nanoemulsions, solid lipid nanoparticles (SLN), niosomes, transfersomes, nanostructured lipid carriers (NLC), polymeric nanoparticles (PNP), etc.

Keywords: olanzapine, drug delivery, nanoparticle, antipsychotic drugs, liposome

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