D-Optimal Mixture Design Enabled Development of Lyophilized Nanoemulsifying Drug Delivery System of Paliperidone

Schizophrenia is a chronic disease with acute psychotic symptoms, which is having frequent recurrence. Paliperidone palmitate (PP) is a second-generation antipsy-chotic drug to treat schizophrenia. The aim of the study was to prepare lyophilized nanoemulsifying drug delivery system (NEDDS) of paliperidone (PD). The primary objective of the current research work was to develop a lyophilized nanoemulsifying drug delivery system (NEDDS) of paliperidone (PD) to improve its oral bioa-vailability and stability. Optimization using D-Optimal Mixture Design DMD) was conducted, and optimized NEDDS was further lyophilized to improve stability. The lyophilized optimized NEDDS was fur-ther evaluated for biopharmaceutical evaluation. A saturation solubility study revealed Peceol, Tween 80, and Plurol Olique CC497 as suitable candidates for oil, surfactant, and co-surfactant, respectively. Optimized NEDDS of PD showed mean globule size (MGS) of 185 nm, PDI of 0.27 and cumulative % drug release within 15 min Q15 of 86.6%. Lyophilized optimized NEDDS was found to have no significant change in quality attributes within the stability study period. A pharmacokinetic study revealed more than two-fold increases in bioavailability for lyophilized optimized NEDDS. Hence, lyophilized NEDDS of PD can be used as an effective approach for the im-provement of oral bioavailability and stability.