Generic Imitrex is an effective and safe medicine prescribed for treating the symptoms of migraine and cluster headaches. It will only manage the symptom of head pain that has already started. It will not prevent headache or reduce the attack of migraine. Generic Imitrex is not used for treating common headaches. It is recommended to use this medicine only after confirming the diagnosis of migraine. The vasoconstriction (narrowing of blood vessels) properties of this medicine in the brain help suffice migraine and cluster headache. The active drug of this medicine is Sumatriptan that helps reduce the triggering factor of pain in head, nausea and migraine.
These are few possible side effects of Generic Imitrex, which usually go away after some time. However, this is not the complete list of adverse effects. You may experience other symptoms as well. If any of them persist, call the doctor right away for medical intervention.