Imitrex is used to treat headaches and migraines that may be caused with aura or without aura which means it may or may not have warning symptoms prior to the beginning of a migraine. It should be used after a headache has started and is not as effective in preventing migraines beforehand nor will it help reduce the frequency of migraines. Imitrex may also prove helpful in relieving symptoms of a headache that may include nausea, vomiting, increased sensitivity to light and sounds, etc. Using Imitrex prior to a headache or a migraine can help you avoid taking other medications to get rid of the pain they cause. Imitrex is available in the form of oral tablets, injections, as well as nasal sprays.