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Imitrex

Generic name: sumatriptan (oral/nasal) [ soo-ma-TRIP-tan ]
Drug class: Antimigraine agents

Medically reviewed by Philip Thornton, DipPharm. Last updated on Oct 28, 2024.

What is Imitrex?

Imitrex 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.

Imitrex is available as oral tablets, a nasal spray, and as an injection. It used to treat migraine headaches in adults. Imitrex will only treat a headache. It will not prevent headaches or reduce the number of attacks.

Imitrex 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.

Warnings

You should not use Imitrex if you have uncontrolled high blood pressure, heart problems, certain heart rhythm disorders, a history of heart attack or stroke, or circulation problems that cause a lack of blood supply within the body.

Do not use this medicine if you have used an MAO inhibitor in the past 14 days, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine.

Also tell your doctor if you are taking an antidepressant such as citalopram (Celexa), desvenlafaxine (Pristiq), duloxetine (Cymbalta), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem), fluvoxamine (Luvox), paroxetine (Paxil), sertraline (Zoloft), or venlafaxine (Effexor).

Imitrex will only treat a headache that has already begun. It will not prevent headaches or reduce the number of attacks.

Do not use Imitrex within 24 hours before or after using any other migraine headache medicine.

Before taking this medicine

You should not use Imitrex if you are allergic to sumatriptan, or if you have ever had:

Do not use Imitrex 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.

Be sure your doctor knows if you also take stimulant medicine, opioid medicine, herbal products, or medicine for depression, mental illness, Parkinson's disease, serious infections, or prevention of nausea and vomiting. These medicines may interact with sumatriptan and cause a serious condition called serotonin syndrome.

To make sure Imitrex is safe for you, tell your doctor if you have ever had:

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 Imitrex. If you use a breast pump during this time, throw out any milk you collect. Do not feed it to your baby.

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

How should I use Imitrex?

Use Imitrex as soon as you notice headache symptoms. Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.

You may receive your first dose in a hospital or clinic setting to quickly treat any serious side effects.

Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you do not understand these instructions.

Take a Imitrex tablet whole with a full glass of water. Do not split the tablet.

After using Imitrex: If your headache does not completely go away, or goes away and comes back, use a second dose if it has been at least 2 hours since your first dose.

Never use more than your recommended dose. Overuse of migraine headache medicine can make headaches worse. Tell your doctor if the medicine seems to stop working as well in treating your migraine attacks.

Do not take more than 200 milligrams of oral Imitrex within 24 hours.

Do not use more than 40 milligrams of Imitrex nasal spray within 24 hours.

Call your doctor if your symptoms do not improve, or if you have more than 4 headaches in one month (30 days).

Store at room temperature away from moisture, heat, and light. Do not store in a refrigerator. Do not freeze.

Dosing information

Usual Adult Dose for Migraine:

Use only after a clear diagnosis of migraine has been established

Oral:
Initial dose: 25 mg, 50 mg, or 100 mg orally, once
-If some response to first dose occurs, a second dose may be administered at least 2 hours after first dose if needed
-Oral doses of 50 and 100 mg may provide greater relief than 25 mg; however, a 100 mg dose may not provide greater effect than a 50 mg dose
Maximum dose: 200 mg per 24 hours

Intranasal:
Nasal spray: Initial dose: 5 mg, 10 mg, or 20 mg into one nostril, once
-Administer the 5 and 20 mg doses as a single spray in 1 nostril; the 10 mg dose may be administered as 5 mg into each nostril
-If some response to first dose occurs, a second dose may be administered at least 2 hours after first dose if needed
Maximum dose: 40 mg per 24 hours

Comments:
-Treatment should be started at the first sign of a migraine headache, or associated symptoms such as nausea, vomiting, or photophobia; this drug should not be used for migraine prophylaxis.
-Higher doses may have a greater effect, but also carry a greater risk of adverse reactions.
-The safety of treating an average of more than 4 headaches in a 30 day period has not been established.

Use: For the acute treatment of migraine with or without aura.

What happens if I miss a dose?

Since Imitrex is used when needed, it does not have a daily dosing schedule. Call your doctor if your symptoms do not improve after using this medicine.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include tremors, skin redness in your arms or legs, weakness, loss of coordination, breathing problems, blue-colored lips or fingernails, vision problems, or a seizure (convulsions).

What should I avoid while using Imitrex?

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

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

Imitrex side effects

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:

Common Imitrex side effects may include:

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.

What other drugs will affect Imitrex?

Using Imitrex while you are using certain other medicines can cause high levels of serotonin to build up in your body, a condition called "serotonin syndrome," which can be fatal. Tell your doctor if you also use:

This list is not complete. Other drugs may interact with sumatriptan, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Does Imitrex interact with my other drugs?

Enter medications to view a detailed interaction report using our Drug Interaction Checker.

Popular FAQ

How often can you take Imitrex (sumatriptan)?

How often you can take Imitrex (sumatriptan) depends on which form you are taking. Imitrex comes as a tablet, nasal spray, and injection. Each form of Imitrex has its own specific dosing recommendations. Do not take more Imitrex than what’s prescribed to you, since taking too much can lead to serious side effects. Continue reading

Ubrelvy vs Imitrex (sumatriptan): How do they compare?

Ubrelvy and Imitrex are both oral tablets used to treat migraine, but there are differences in the way they work. Ubrelvy prevents a protein called CGRP thought to play a role in migraine attacks from binding to its receptor and Imitrex is thought to bind to serotonin 5‑HT1B/1D receptors, and inhibit pro-inflammatory substances Although no head-to-head comparison trials compare Ubrelvy to Imitrex, indirect evidence suggests that overall, Ubrelvy is no more effective, and may be inferior to Imitrex at relieving migraine in adults who are able to tolerate triptans. For those adults with moderate-to-severe migraine attacks that cannot tolerate triptans or who have found them ineffective, Ubrelvy is beneficial for treating migraines compared to no treatment. Ubrelvy is associated with fewer side effects than Imitrex, but is more expensive, costing almost twice as much. Continue reading

How long does Imitrex (sumatriptan) take to work?

Imitex (sumatriptan) can start to work within 30 minutes of taking a dose. However, it may take a few hours for you to notice the full effects. Continue reading

Why does Imitrex (sumatriptan) make me feel weird?

Imitrex (sumatriptan) can cause a variety of side effects, which may make you feel weird after taking it. It is not fully understood what causes these side effects, but some could be related to how Imitrex affects blood vessels and nerves. Continue reading

Can Imitrex (sumatriptan) cause rebound headaches?

Yes, Imitrex (sumatriptan) can cause rebound headaches (also known as medication-overuse headaches). Rebound headaches are more likely to occur if you take Imitrex alone or a combination of Imitrex and other headache medications (e.g., opioids, analgesics) for 10 or more days per month. Continue reading

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Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Imitrex only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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