Get emergency medical help if you have signs of an allergic reaction to Imitrex: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using Imitrex and call your doctor at once if you have:
sudden and severe stomach pain and bloody diarrhea;
severe chest pain, shortness of breath, irregular heartbeats;
a seizure (convulsions);
severe headache, blurred vision, pounding in your neck or ears;
blood circulation problems in your legs or feet - cramps, tight or heavy feeling, numbness or tingling, muscle weakness, burning pain, cold feeling, color changes (pale or blue), hip pain;
heart attack symptoms - chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating;
high levels of serotonin in the body - agitation, hallucinations, fever, sweating, shivering, fast heart rate, muscle stiffness, twitching, loss of coordination, vomiting, diarrhea; or
signs of a stroke - sudden numbness or weakness (especially on one side of the body), sudden severe headache, slurred speech, problems with vision or balance.
Common Imitrex side effects may include:
pain or tight feeling in your chest, throat, or jaw;
pressure or heavy feeling in any part of your body;
numbness or tingling, feeling hot or cold;
dizziness, drowsiness, weakness;
unusual or unpleasant taste in your mouth after using the nasal medicine;
pain, burning, numbness, or tingling in your nose or throat after using the nasal medicine; or
runny or stuffy nose after using the nasal medicine.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Imitrex side effects (more detail)
