Drying process for preparing crystalline solid famciclovir
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United States of America Patent
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Jan 6, 2009
Grant Date -
Jan 5, 2006
app pub date -
May 18, 2005
filing date -
May 18, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a drying process for preparing crystalline solid famciclovir form I comprising the steps of: i) preparing a wet crystalline form of famciclovir; ii) drying the wet crystalline form of famciclovir at a temperature of below 50° C. until the crystalline form contains less than 15% (wt/wt) wetness; and iii) drying the wet crystalline form of famciclovir at a temperature of above 50° C. until the wet crystalline form of famciclovir contains less than 0.05% (wt/wt) water to obtain crystalline solid famciclovir form I.
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