摘要：

A carrier system for a drug which allows the sustained and prolonged release of the drug which is comprised of (i) a porous carrier material which is insoluble or only slightly soluble in the body, which is in compacted form or powder form and which contains cavities which are connected to the outer surface by narrow pore necks, the mean diameters of the cavities in section being over twice as large as the mean internal widths of the necks of the pores, and the internal width of the necks of the pores being preponderantly less than 0.1 mu m, and (ii) a drug or pharmaceutically active substance is embedded or contained in the cavities.

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