FORMULATION AND IN VITRO EVALUATION OF AZILSARTAN MEDOXOMIL NANOSUSPENSION

Abstract

Objective: The objective of this study was to formulate and evaluate of the poorly soluble drug, azilsartan medoxomil into nanosuspension to increase the solubility and enhance the dissolution rate and then improve its bioavailability.Methods: Nanosuspension of azilsartan medoxomil was prepared using solvent-antisolvent precipitation method using PVP-K30 as a stabilizer. Eight formulations were prepared to show the effect of different parameters in which four formulations show the effect of stabilizer concentration, three formulations show the effect of stirring speed and two formulations prepare to show the effect of the addition of co-stabilizer such as sodium lauryl sulphate (SLS) and tween 80. All these formulation are evaluated for their particle size and entrapment efficiency. The selected one was evaluated for zeta potential, scanning electron microscope (SEM), saturation solubility, and in vitro drug release.Results: All the prepared formulations were in the nano size. The optimum concentration of the stabilizer was in the formulation when the drug: stabilizer ratio 1:1 and optimum stirring speed was 300 rpm. Dramatic effect on the particle size reduction was found by the addition of co-stabilizer (SLS) in formulation F3 that has P. S 157±0.0 nm. The selected formula F3 showed an enhanced dissolution profile compared to the pure drug at all-time intervals.Conclusion: The results show that the formulation that contain drug: PVP-K30: SLS in ratio 1:0.75:0.25 is the best one and can be utilized to formulate azilsartan medoxomil nanosuspension.