Sumatriptan is a headache medicine that narrows blood vessels around the brain. Sumatriptan also reduces substances in the body that can trigger headache pain, nausea, sensitivity to light and sound, and other migraine symptoms.

Sumatriptan is used to treat migraines and cluster headaches in adults. Sumatriptan will only treat a headache. This medicine will not prevent headaches or reduce the number of attacks.

Sumatriptan should not be used to treat a common tension headache, or a headache that causes loss of movement on one side of your body. Use this medicine only if your condition has been confirmed by a doctor as migraine headaches.

Sumatriptan may also be used for purposes not listed in this medication guide.

You should not use sumatriptan if you are allergic to it, if you have a headache that seems different from your usual migraine headaches, or if you have ever had:

• heart problems, or a stroke (including "mini-stroke");
• coronary artery disease, angina (chest pain), blood circulation problems, lack of blood supply to the heart;
• circulation problems affecting your legs, arms, stomach, intestines, or kidneys;
• a heart disorder called Wolff-Parkinson-White syndrome;
• uncontrolled high blood pressure; or
• severe liver disease.

Do not use sumatriptan if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.

Tell your doctor if you have ever had:

• liver or kidney disease;
• epilepsy or other seizure disorder;
• high blood pressure, a heart rhythm disorder; or
• risk factors for coronary artery disease (such as diabetes, menopause, smoking, being overweight, having high blood pressure or high cholesterol, having a family history of coronary artery disease, or being older than 40 and a man).

It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Sumatriptan can pass into breast milk. Do not breast-feed within 12 hours after using sumatriptan. If you use a breast pump during this time, throw out any milk you collect. Do not feed it to your baby.

Sumatriptan injection is not approved for use by anyone younger than 18 years old.

Use Sumatriptan (Injection)(Subcutaneous) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using sumatriptan 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);
• 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, fast heart rate, overactive reflexes, nausea, vomiting, diarrhea, loss of coordination, fainting;
• increased blood pressure--severe headache, blurred vision, pounding in your neck or ears, anxiety, nosebleed; 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:

• numbness, tingling, warmth, redness, or burning sensation;
• pressure or heavy feeling in any part of your body;
• dizziness, drowsiness, feeling weak or tired;
• neck pain or stiffness; or
• pain or redness where the medicine was injected.

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.

Do not use sumatriptan within 24 hours before or after using another migraine headache medicine, including:

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Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.