Nanoencapsulation Improves Relative Bioavailability and Antipsychotic Effect of Olanzapine in Rats
This study aimed to investigate the pharmacokinetics, tissue distribution and antipsychotic activity of olanzapine administered as free drug (OLA-FREE) or loaded into lipid-core nanocapsules (OLA-LNC). OLA-LNC were successfully developed with a particle size of 142 ± 4 nm and a zeta potential of –19.6 ± 0.6 mV. Pharmacokinetics and tissue distribution studies were carried out after the administration of free and nanoencapsulated olanzapine (10 mg/kg) by intraperitoneal route to male Wistar rats. Higher olanzapine concentrations and AUC0–12 h were found in plasma and tissues evaluated after the administration of OLA-LNC compared to the drug in the free form, resulting in a relative bioavailability of 226.7% in the plasma. As a result olanzapine loaded lipid-core nanocapsules presented pronounced and long-lasting effects on central nervous system. These nanocapsules (10 mg/kg, i.p.) significantly diminished the stereotyped behavior induced by D, L-amphetamine up to 12 hours whereas olanzapine free-form (10 mg/kg, i.p.) was effective during 03 hours only. Moreover, olanzapine loaded lipid-core nanocapsules (1.0 mg/kg, i.p.) have shown a marked sedative effect and also prevented the prepulse inhibition disruption induced by apomorphine at lower dose than olanzapine in free-form (2.5 mg/kg, i.p.). Herewith, we point to the nanoencapsulation as a strategy for reducing the concentration of olanzapine in pharmaceutical formulations.
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Document Type: Research Article
Publication date: August 1, 2015
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- Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.
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