Enhancement of In Vivo Efficacy and Oral Bioavailability of Aripiprazole with Solid Lipid Nanoparticles
Aripiprazole (ARP), a second-generation or atypical antipsychotic, is poorly soluble and undergoes extensive hepatic metabolism and P-glycoprotein efflux which lead to reduced in vivo efficacy and increased dose-related side effects. To enhance in vivo efficacy and oral bioavailability of aripiprazole, aripiprazole-loaded solid lipid nanoparticles (SLNs) were developed using tristearin as solid lipid. Tween 80 and sodium taurocholate were used as surfactants to prepare SLNs using microemulsification method. SLNs were characterized for particle size, zeta potential, entrapment efficiency, and crystallinity of lipid and drug. In vitro release studies were performed in water containing 0.5% sodium dodecyl sulfate. Pharmacodynamic evaluation was carried out in laca mice using dizocilpine-induced schizophrenic model where behavioral evaluation revealed better in vivo efficacy of SLNs. Pharmacokinetics of aripiprazole-loaded SLNs after oral administration to conscious male Wistar rats was studied. Bioavailability of aripiprazole was increased 1.6-fold after formulation of aripiprazole into SLNs as compared to plain drug suspension. The results indicated that solid lipid nanoparticles can improve the bioavailability of lipophilic drugs like aripiprazole by enhancement of absorption and minimizing first-pass metabolism.
KEY WORDSaripiprazole solid lipid nanoparticles antischizophrenic solid lipid nanoparticles bioavailability enhancement dizocilpine-induced schizophrenia
The authors are thankful to Unichem Laboratories, India for providing aripiprazole samples ex-gratis
The current research work was funded by AICTE, New Delhi, India (vide sanction no. 20/AICTE/RIFD/RPS (POLICY-1)27/2012-13).
Compliance with Ethical Standards
The study was previously approved by Institutional Animal Ethics Committee (IAEC, UIPS, Panjab University, Chandigarh). The experiments were conducted as per CPCSEA guidelines (Committee for Prevention, Control, and Supervision of Animal Experiments).
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