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Abstract

The invention relates to the preparation of microcapsules ensuring direct tablet compression of a drug and rapid release of the drug as active ingredient from the tablets, which comprises microencapsulating the crystal granules of cyclohexane-insoluble active ingredients with a particle size of at most 1000 .mu.m, preferably smaller than 60 .mu.m and particularly preferably smaller than 30 .mu.m, in cyclohexane medium with ethylcellulose taken in an amount of 1:30 to 1:5, preferably 1:20 to 1:10, in relation to the core material, if desired, in the presence of 0.001 to 1.0% by weight/volume, preferably 0.01 to 0.05% by weight/volume, of an anionic surface-active agent; or post-treating the drug granules microencapsulated with ethylcellulose by a cyclohexane-dissolved surface-active agent taken in an amount of 0.001 to 1.0% by weight/volume, preferably 0.1 to 0.5% by weight/volume, in relation to cyclohexane.

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First Claim