The invention discloses a method for preparing
carvedilol solid dispersions by virtue of a supercritical anti-
solvent technique. The method comprises the following steps: (S1) dissolving
carvedilol and a water-soluble carrier into an
organic solvent, so as to obtain a
carvedilol-carrier
mixed solution; (S2) introducing CO2 into a
crystallization kettle, and regulating the
temperature and pressure in the
crystallization kettle; (S3) continuing to introduce CO2 to keep the
temperature and pressure in the
crystallization kettle constant, and simultaneously introducing the
mixed solution prepared in the step (S1) into the crystallization kettle; and (S4) after the carvedilol-carrier
mixed solution is introduced, continuing to introduce CO2 to keep the
temperature and pressure in the crystallization kettle constant, finally relieving the pressure, and after the pressure in the crystallization kettle is decreased to the
atmospheric pressure, opening the crystallization kettle, and collecting the carvedilol
solid dispersions. By virtue of the method, the carvedilol
solid dispersions with obviously improved
dissolution characteristics can be prepared, and furthermore, the
bioavailability of indissolvable drugs can be improved.