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Lipid-based self-nanoemulsifying drug delivery system was explored to improve the oral bioavailability and target specificity of mebendazole for treatment of lymphatic worm infestations. Ternary phase diagrams were constructed to select suitable oil-surfactant mixture. Liquid self-nanoemulsifying drug delivery system consisting of Capmul MCM L8, Chromophore RH40 and tocopherol polyethylene glycol succinates a pre-concentrate was systematically optimized using 32 full factorial designs. β-cyclodextrin-based nanosponges were used to prepare solid self-nanoemulsifying drug delivery system. Characterization of liquid self-nanoemulsifying drug delivery system was carried out using percent transmission, globule size, zeta potential, polydispersity index and drug content. Globule size in the range of 50-90 nm and zeta potential of –5 to –12 mV was obtained, which co-related well with percent transmission. Powder X-ray diffraction, differential scanning calorimetry and scanning electron microscope of solid self-nanoemulsifying drug delivery system indicated the presence of mebendazole as a molecular dispersion. Ex vivo studies showed nearly five-fold increase in the flux. In vivo studies showed two-fold increase in bioavailability. Significant enhancement in drug dissolution and saturation solubility from solid self-nanoemulsifying drug delivery system resulted in an increase in the bioavailability. Besides this, greater surface area, improved release, P-gp modulation potential of excipients and lymphatic bypass via Peyer’s patches protected drug from hepatic first pass metabolism all of which would contribute to the observed improved bioavailability. Lymphatic transport of drug could achieve target specificity in lymphatic filariasis.

Self-nanoemulsifying Drug Delivery System of Mebendazole for Treatment of Lymphatic Filariasis