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Inhalation delivery is a promising route of drug administration, including systemic action. It should be considered that the particles of drug aerosol should have a diameter in the range of 1 to 3 ?m. Microspherical particles based on protein molecules can provide increased bioavailability of drugs with poor water solubility. In the present work, microspherical particles of sodium caseinate with a model hydrophobic drug ? phenacetin were obtained using spray drying method. Average aerodynamic diameter of resulting...