Enhancement of Solubility and Oral Bioavailability of Poorly Soluble Drug Rilpivirine by Novel Self Emulsifying Drug Delivery System

Aim of present study was to develop self emulsifying drug delivery system (SEDDS) for enhancement of solubility, dissolution rate and oral bioavailability of model drug Rilpivirine. Fifteen formulations were prepared using different oils, surfactants and co-surfactants. A pseudo ternary phase diagram was constructed to identify the self-micro emulsification region. Further, the resultant formulations were investigated for clarity, phase separation, drug content, % transmittance, globule size, freeze-thaw stability and in vitro dissolution studies. On the basis of dissolution profile and other above mentioned studies, F5 was found to be the best formulation of Rilpivirine SEDDS which contains Captex 355(Oil), Kolliphor RH 40 (Surfactant) and PG (Co-surfactant). In vivo studies revealed that the oral bioavailability of Rilpivirine from SEDDS was 2.2-fold higher compared to that of pure Rilpivirine suspension in rats, suggesting a significant increase (p