Objective: The aim of this investigation was to enhance the solubility and bioavailability BCS class II poorly water-soluble drug ambrisentan by solid dispersion (SD) techniques using Gelucire 50/13 as a hydrophilic carrier. Methods: Solid prepared kneading method different dug: carrier ratios. Prepared SD characterized for solubility, content, percentage yield, in vitro dissolution, ex vivo pe...