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Drug patents are extended for fourteen years from the original first sale date. Imitrex STATdose expired in December of 2006, while Imitrex tablets expired in 2009. Imitrex nasal spray will expire in 2011, as well Imitrex NS.
Source:
Health Central: Migraine Abortive Medications - Triptan Prices and Patent Expirations
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