Sustained-release preparation
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United States of America Patent
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Feb 24, 2004
Grant Date -
Nov 8, 2001
app pub date -
May 31, 2001
filing date -
Jun 26, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sustained-release preparation comprising a bioactive substance having an acidic group and a biodegradable polymer having an optionally protected basic group which improves the rate of incorporation of the bioactive substance, suppresses its leakage early after adminstration, and exhibits constantly suppressed release for an extended period of time.
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