Sumatriptan Without Rx.
Imitrex is a drug that is used to treat an existing headache or migraine. It does not have preventative properties, and instead should be used following the onset of a headache or migraine. It is important to recognise that Imitrex should only be used for appropriate headaches. It can only be used if you have been diagnosed as being a migraine sufferer, and should not under any circumstance, be used to treat a common tension headache, or a headache that causes loss of movement on one side of the body.