Polymer:drug co-formulations are often used in pharmaceuticals to improve drug bioavailability by enhancing wettability and modifying the release profile for poorly water-soluble drug mols.This work examines poorly water-soluble drug mols. co-formulated using Nektar Supercritical Fluid Technol.TM.Present conventional technol. does not allow control of particle characteristics.The purpose of this study was thus to show that supercritical fluids offer an alternative approach to conventional drug-polymer co-formulation because particle characteristics such as size, residual solvent and morphol. can be directed.Using this technol., the drug particles can be dispersed as a solid solution or as a semi-crystalline dispersion within the release-modifying polymer.A single solution containing the dissolved drug and polymer was fed together with supercritical carbon dioxide through a specially designed co-axial mixing nozzle into a particle formation vessel at constant temperature and pressure.The supercritical fluid dissolves the solvent leading to the formation of particles, which are retained in the vessel.By changing the processing parameters and solvent system it is possible to direct particle characteristics.Using the Nektar Supercritical Fluid Technol. TM process it is possible to provide co-formulated samples with an enhanced dissolution profile for poorly water-soluble drugs.Co-formulated samples show complete and rapid drug dissolution