Formulation and in vitro and in vivo characterization of a phenytoin self-emulsifying drug delivery system (SEDDS)

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
Eman Atef, Albert A Belmonte

Abstract

The aim of this study is to develop and characterize a self-emulsifying drug delivery system (SEDDS) of phenytoin, and to compare its relative bioavailability to a commercially available suspension. Four phenytoin SEDDS were prepared and evaluated. Following emulsification, the optimized formula was selected to have the smallest mean particle size and the highest absolute zeta potential, which should yield the formation of a stable emulsion. Its dissolution characteristics were superior to the other SEDDS formulas. In vivo and in vitro tests were run to compare the optimized formula, SEDDS II, to a commercially available Dilantin suspension. The in vitro dissolution indicated a significant improvement in phenytoin release characteristics. The in vivo study using male rats showed a clear enhancement in phenytoin oral absorption from SEDDS compared to Dilantin suspension. The area under the curve AUC((-10min-->10h)) of phenytoin after SEDDS administration increased by 2.3 times compared to Dilantin (p<0.05), and the rate of absorption of phenytoin was significantly faster from the SEDDS. The concentration after 30min (C(30min)) of SEDDS administration was 4.9 times higher than C(30min) after Dilantin administration (p<0.05). A su...Continue Reading

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