Formulation and Evaluation of Clotrimazole Niosomal Gel for Topical Application

Objective: In the present investigation, an attempt is made to develop and characterize niosomal gel formulation of clotrimazole to increase retention time in the dermis layer through controlled release of the drug. Methodology: Clotrimazole niosomes were prepared by thin film hydration method using span 40 (as non-ionic surfactant) and cholesterol (as stable vesicle forming agent). The niosomal dispersion was evaluated for vesicle size, surface morphology, percent entrapment efficiency and in vitro drug release. Results: Among the five formulations prepared, the formulation CN3 (containing 100 mg drug, 200 mg surfactant) was found to be promising. Selected niosomal suspension (CN3) containing clotrimazole equivalent to 2 % w/w was incorporated into gel base composed of carbopol (1%), triethanolamine 0.3% and distilled water quantity sufficient. The gel was studied for it’s different parameters such as pH, in vitro drug release, anti-fungal activity and skin irritation effect. Conclusion: The studies suggest that encapsulating clotrimazole in nonionic surfactant vesicles would provide better patient compliance by achieving prolonged release of the drug to the dermis with improved efficacy.