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See the DrugPatentWatch profile for Guanfacine
Guanfacine is sold by multiple manufacturers, depending on the country and on whether the product is immediate-release (IR) or extended-release (ER).
The manufacturer is tied to the exact product presentation, so the most reliable way is to check: - The label (brand name and strength) - Whether it says “extended-release” (ER) or “immediate-release” (IR) - The national drug code (NDC) or equivalent identifier on the package/receipt (U.S. users) If you share the brand name (or whether it’s Intuniv ER vs immediate-release guanfacine) and your country, I can narrow down which manufacturers typically produce that exact product.
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