Keywords : Smix ratio
European Journal of Molecular & Clinical Medicine,
2018, Volume 5, Issue 1, Pages 282-290
The aim of the present study was focused on the development of nanoemulsion of carvedilol, an antihypertensive drug, to be administered through oral route. Twelvenanoemulsionformulations of carvedilol containing different oily phases and different proportions of surfactant-Tween 80 and co-surfactant- PEG 400 were prepared by ultrasonication method and after preliminary evaluation four formulations (F1, F2, F3& F4) were selected for further study. Prepared carvedilol containing nanoemulsions were evaluated for-droplet size and shape through Transmission Electron Microscopy, drug contents and in-vitro drug release patterns through dissolution studies. The entrapment efficiency for various formulations was found to be between 61.02±0.231% to 96.57±0.212%. The drug showed better release rate in comparison to conventional dosage form. All the formulations showed better results in terms of stability. Among the four formulations the best results were found with F1 formulation of carvedilol which gave the highest release of drug 31.28±3.46% after 1 hr and 88.41±2.72% after 24 hrs. The droplet size range in optimized formulation F1, F2, F3 and F4 was found to be between 20.76 to 107.38nm. The droplets were uniform and spherical in shape. It can be concluded that for oral administration of carvedilol a better solubility and bioavailability can be achieved by use of nanoemulsion formulation of the drug which otherwise has poor solubility and bioavailability.