Sustained-release composition process for producing the same and preparation thereof
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United States of America Patent
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Issued Date -
May 4, 2006
app pub date -
Jun 9, 2003
filing date -
Jun 20, 2002
priority date (Note) -
Abandoned
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Abstract
The present invention provides a sustained-release composition by which a sustained-release effect can be obtained for a long time when injecting microparticles of the composition in an amount that can be subcutaneously or intramuscularly injected to a human with ease and without pain. The composition comprises porous hydroxyapatite microparticles having pores embolized by filling the pores in the microparticles with a biologically active drug, a human serum protein, and a mucopolysaccharide, and adding a divalent metal ion. Alternatively, the composition comprises porous hydroxyapatite microparticles having pores embolized in the outer layer by filling the pores in the microparticles with a biologically active drug, a human serum protein, and a water-soluble calcium salt one after another or at one time, and then adding sodium carbonate, sodium hydrogen carbonate, or an aqueous carbonate ion solution.
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