US Patent
US8481565 — Method for stabilizing anti-dementia drug
Formulation · Assigned to Eisai R&D Management Co Ltd · Expires 2026-10-04 · 0y remaining
Vulnerability score
48/100
Strong — defensible against typical IPR challenges
What this patent protects
This patent protects a method for stabilizing an anti-dementia drug, specifically donepezil hydrochloride, in a pharmaceutical composition.
USPTO Abstract
The present invention provides a method for stabilizing an anti-dementia drug in a pharmaceutical composition containing the anti-dementia drug and a high molecular weight basic substance by adding a high molecular weight acidic substance to said pharmaceutical composition. Further, the present invention provides a pharmaceutical composition containing an anti-dementia drug and a high molecular basic substance in which a high molecular weight acidic substance is contained for stabilizing the anti-dementia drug. Furthermore, the present invention provides a method for manufacturing a pharmaceutical composition which comprises steps wherein a solution or suspension containing a high molecular weight acidic substance is added to a mixture of an anti-dementia drug and a high molecular weight basic substance for the sake of stabilizing the anti-dementia drug.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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