Process for producing efonidipine hydrochloride preparations

Details Process for producing efonidipine hydrochloride preparations Process for producing efonidipine hydrochloride preparations

A - Human Necessities

61

K

A61K 31/675 (2006.01) A61K 9/14 (2006.01) A61K 9/16 (2006.01) A61K 31/66 (2006.01)

Patent

CA 2248582

The present invention can form an amorphous solid dispersion of efonidipine hydrochloride having a high intestinal absorbability which can be formed by subjecting a mixture containing efonidipine hydrochloride of formula (I), hydroxypropylmethylcellulose acetate succinate and optionally a thermostabilizer to a step A of heat treatment at from 85 to 140 °C or mechanochemical treatment at from 0 to 140 °C, and then to a step B of dipping treatment into a water-containing solution, impregnation treatment with a water-containing solution or contacting treatment with a water vapor-containing gas; or treating the above-mentioned mixture with a hot steam at from 100 to 140 °C and a high pressure. Further, in the above-mentioned step A, the mixture is subjected to high frequency heating, making it possible to give a solid dispersion of efonidipine hydrochloride having a high intestinal absorbability without using the step B. This process is quite advantageous in the production in that the use of an organic solvent is not required.

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