Preparation and Evaluation of In Situ Gelling Nimesulide Loaded Liquid Suppository using Poloxamer and Menthol

The purpose of present work was to prepare a nimesulide-loaded liquid suppository using menthol and to study the effects of various penetration enhancers such as neem oil, tulsi oil and ethanol on the cumulative percentage release of nimesulide. The physicochemical properties such as gelation temperature and gel strength of various formulations composed of nimesulide, menthol and poloxamer 188 were investigated. The in vitro study of nimesulide delivered by the liquid suppositories composed of poloxamer 188, menthol and various concentrations of penetration enhancers were performed. The in vitro studies were performed using Keshary-Chein diffusion cell and Small wonder (Lyzer apparatus). The cumulative percentage release of nimesulide of each formulation were calculated and compared with the other formulations. The liquid suppository formulations containing neem oil 2% and tulsi oil 2% showed excellent release rate as compared to other formulations.