Self Nano Emulsifying Formulation of Nateglinide with Improved Drug Solubility and Dissolution

The objective of the present work was to formulate and evaluate novel self-nano emulsifying drug delivery system (SNEDDS) of poorly soluble drug Nateglinide. Poor water solubility and slow dissolution rate are major issues for most upcoming and existing biologically active pharmaceutical compounds. Nateglinide is Biopharmaceutical Classification System Class-II drug that has low solubility and high permeability. Surfactants and oil was selected based on solubility studies were further screened for their efficiency in formulation. Acrosyl K-135 was used as oil phase and Kolliphor RH 40 and Transcutol P were used as surfactant and co-surfactant respectively for formulation. Formulation F13 was found to be optimized formulation on the basis of in vitro dissolution studies, particle size and zeta potential. The particle size of the optimized SNEDDS formulation was found to be 74.6 nm and Z-Average was found to be 43.1 nm, indicating all the particles were in the nanometer range and the zeta potential of the optimized SNEDDS formulation was found to be -18.4 mV. The optimized formulation was then subjected to stability studies and was found to be stable after 6 months. Thus, the study confirmed that the SNEDDS formulation can be used as a possible alternative to traditional oral formulations of Nateglinide to improve its solubility.