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In generic world, excipients used in the product are known and the product is stable. But, API-compatibility study is still needed because source of excipients is different. Different source of an excipient may have different starting materials, different process, and different impurity profile, thus indicating a potential impact on API
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API:Filler: 1:10
API: Binder or disintegrant: 1:1
API: lubricant or glidant, or surfactant: 10:1
•Container/closure: scintillation vial/tight seal. 500 mg powders/vial.
•Storage conditions: Stressed! 40¡ãC/75% RH open/closed, 55-60¡ãC ambient humidity.
•Sampling time: Initial, 2 weeks, 4 weeks.
•Sample analysis: physical appearance and impurity
Other things to be considered:
1: API control must be prepared and tested in order to know the real compatibility problem under stressed conditions.
2: A second set of samples may be prepared in which 5% of water is added into the powder mixture. Double the work load☺
3:Stearicacid and Dicalciumphosphate at 40¡ã
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•To obtain possible quantitative relationships to excipient characteristics and interaction rates
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•Impurities: total level and individual level
existing peaks vsnew peaks.
•To give the ranking order: selection of ¡°relatively¡±good one over ¡°less¡±good in the formulation
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4Â¥: Originally posted by dongliang09 at 2011-08-04 14:30:07:
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