Process for preparing antihistamine tannates
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United States of America Patent
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Sep 2, 1997
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N/A
app pub date -
Jun 28, 1996
filing date -
Jun 28, 1996
priority date (Note) -
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Abstract
A process for preparing pure antihistamine tannate compositions. The antihistamine in the form of its free base is contacted with tannic acid in the presence of water for a period of time of about 5 minutes to 4 hours and at a maximum temperature such that not more than about 5 wt. % of the antihistamine tannate will be decomposed. Water is removed from the antihistamine tannate by freeze-drying.
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