The generic version of Imitrex Injection (called sumatriptan) is now shipping in the US. I don’t know if it is available in other countries, nor do I know when/if the tablets will be available. I doubt all pharmacies have it in stock yet. I recommend calling your pharmacy before taking your prescription in.
From Par Phamaceutical’s press release:
Par Pharmaceutical Begins Shipment of Sumatriptan Injection
November 6, 2008 – Par Pharmaceutical Companies, Inc. today announced that it will begin shipping generic versions of Imitrex® Injection (sumatriptan succinate injection) 4mg and 6mg starter kits and 4mg and 6mg prefilled syringe cartridges to the trade immediately. In addition, Par anticipates launching the 6mg vials early next year.