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Abstract

The invention relates to spherical granules having a uniform grain size and a uniform density which are suitable for a controlled-release preparation, a process for producing the same, and a spherical granule preparation using the same. Specifically, the invention relates to a process for producing spherical granules comprising the steps of: wetting powder materials comprising one or more kinds of pharmaceutical substances and have a mean particle size of from 1 to 100 .mu.m; charging the wet powder materials into a centrifugal fluidized granulating apparatus; spraying a liquid to the wet powder materials at a rate of less than 3% based on the plastic limit of the powder materials per min. while rotating the rotary disk of the centrifugal fluidized granulating apparatus until the liquid content of the powder materials reaches 75 to 120% based on the plastic limit of the powder materials, and drying the sprayed product to give spherical granules; spherical granules having a mean grain size of 100-1000 .mu.m, in which at least 90% by weight of the total amount of the spherical granules has such a grain size distribution that the maximum grain size is not larger than 1.2 times the minimum grain size, and the difference in density between the individual spherical granules is less than 0.05 g/cm.sup.3 ; and a spherical granule preparation comprising the spherical granules.

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First Claim