Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using rizatriptan and call your doctor at once if you have:
sudden and severe stomach pain and bloody diarrhea;
cold feeling or numbness in your feet and hands;
severe headache, blurred vision, pounding in your neck or ears;
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, nausea, 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 side effects may include:
dizziness, drowsiness, feeling tired; or
pain or a feeling of pressure in your throat or chest.
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.
 Rizatriptan side effects (more detail)
