Efavirenz Loaded Mixed Polymeric Micelles: Formulation, Optimization, and In Vitro Characterization

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Nanotechnology

Background:

• Efavirenz (EFZ) is a crucial antiretroviral (ARV) drug classified as Biopharmaceutics Classification System (BCS) Class-II.
• Poor aqueous solubility of EFZ limits its oral bioavailability and therapeutic efficacy.
• Novel drug delivery systems are needed to overcome EFZ solubility challenges.

Purpose of the Study:

• To formulate and optimize Efavirenz-loaded binary-mixed micelles for improved oral administration.
• To investigate the synergistic interactions between Cremophor RH 40 and Phospholipon 80H in micelle formation.
• To characterize the physicochemical properties and drug entrapment of the developed micellar system.

Main Methods:

• Utilized Rubingh's regular solution theory to confirm synergistic behavior of micelle components.
• Employed solvent evaporation method for formulating binary-mixed micelles.
• Applied a 3^2 factorial design for optimization of independent variables.
• Characterized micelles for morphology, particle size, zeta potential, entrapment efficiency, and drug loading.

Main Results:

• Confirmed synergistic interactions and successful formation of mixed micelles.
• Optimized formulation exhibited nanometric particle size (17.27 ± 0.079 nm).
• Achieved high entrapment efficiency and good colloidal stability for the EFZ-loaded micelles.

Conclusions:

• Binary-mixed micelles are effective nanocarriers for improving Efavirenz solubility and oral delivery.
• The optimized formulation shows promise for enhancing Efavirenz's role in antiretroviral therapies.
• This approach offers a viable strategy for oral administration of poorly soluble BCS Class-II drugs.