A triptan (acute migraine medicine)
Sumatriptan
A triptan taken to stop a migraine attack once it has started — fast and effective for many, but for treating attacks rather than preventing them, and not for people with certain heart or circulation problems.
What is Sumatriptan?
Sumatriptan is a triptan, the standard class of medicine for treating a migraine attack once it is under way. It relieves the headache and associated symptoms such as nausea and sensitivity to light and sound.
Education and reference only. This is a plain-language guide to Sumatriptan — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Sumatriptan is a triptan, the standard class of medicine for treating a migraine attack once it is under way. It is taken to relieve the headache and the associated nausea and sensitivity to light and sound — it is a treatment for attacks, not a preventer, so it does not reduce how often migraines come. It is one of the most widely used triptans in the UK and is available in several forms, including a tablet, a nasal spray and an injection for when speed matters or when nausea makes tablets hard to keep down. A lower-strength tablet can be bought from pharmacies under supervision.
How it works
During a migraine, blood vessels around the brain widen and inflammatory nerve signals are released, driving the throbbing pain. Sumatriptan stimulates particular serotonin receptors (5-HT1 receptors) on these blood vessels and nerves, which narrows the widened vessels back down and calms the release of the inflammatory messengers. This both eases the pain and settles the other migraine symptoms. Because it acts by narrowing blood vessels, it can also affect vessels elsewhere in the body — which is why it is not suitable for people with significant heart or circulation disease.
Company & origin
Originated / developed by: Glaxo (now GSK).
Sumatriptan, the first triptan, was discovered by Patrick Humphrey and colleagues at Glaxo Laboratories in the UK in the early 1980s (compound GR 43175, patent filed 1982). It was first approved in the UK as Imigran in 1991 and by the US FDA (as Imitrex) in 1992; Glaxo is now GSK.
What it treats
Conditions Sumatriptan is used for
Practical use
How to take Sumatriptan
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it as soon as the migraine headache itself begins, not during the warning aura stage beforehand.
- If the migraine eases and then returns, a further dose may be possible after a gap, but do not exceed the limits you have been given.
- Rest in a quiet, dark room if you can, as this often helps the medicine work.
- Do not use it too often, as frequent use can lead to medication-overuse headache.
- Do not take it within 24 hours of another triptan or of an ergotamine-type migraine medicine.
- It is not suitable for people with certain heart conditions, uncontrolled high blood pressure or a history of stroke, so tell your prescriber about these.
Weighing it up
Advantages & disadvantages of Sumatriptan
Advantages
- Specifically targets migraine attacks rather than just dulling pain.
- Can relieve the associated nausea and light sensitivity as well as the headache.
- Available in several forms, including tablets, a nasal spray and an injection for fast-onset attacks.
- Often effective when ordinary painkillers have not helped a migraine.
Disadvantages
- Not suitable for people with certain heart disease, uncontrolled high blood pressure or previous stroke.
- Can cause chest or throat tightness, flushing, tingling and drowsiness.
- Overuse can lead to medication-overuse (rebound) headache.
- Does not prevent migraines and only helps once an attack has started.
Practical use
Good to know
The key to using sumatriptan well is timing: take it as soon as the headache phase of a migraine begins, not during the warning aura beforehand, and not days in advance. If one dose does not work for a particular attack, repeating it for that same attack usually will not help, though a second dose may be used if the migraine eases and then returns. Crucially, it should not be used on too many days each month, because frequent use can cause medication-overuse headache — a stubborn, near-daily headache that paradoxically comes from the very treatment. If you are reaching for it often, that is a signal to discuss prevention.
Who should not take it / use with caution
- People with ischaemic heart disease or angina, a previous heart attack, or coronary spasm — its blood-vessel-narrowing action makes it unsafe here.
- People who have had a stroke or "mini-stroke" (TIA), or who have significant peripheral artery disease, and people with uncontrolled high blood pressure.
- Used with caution where there are risk factors for heart disease, and it should not be combined with certain other migraine medicines (ergotamine) or taken close to an MAOI antidepressant.
Monitoring
- No routine blood tests
- How many days a month it is used, to avoid medication-overuse headache
- Whether prevention is needed if attacks are frequent, and review of heart risk factors
Side effects
- Tingling, warmth or flushing, and a sense of heaviness or tightness — including in the chest or throat — which is usually harmless but can feel alarming.
- Drowsiness, dizziness, and a bitter taste or nasal irritation with the spray.
- Rarely, genuine chest tightness from effects on the heart's blood vessels (seek help if chest pain is severe or persistent), and, with frequent use, medication-overuse headache.
Key interactions
- It should not be combined with ergotamine or other triptans for the same attack, and should be separated from MAOI antidepressants.
- Used with serotonin-raising medicines (SSRIs, SNRIs) there is a small risk of serotonin syndrome, so any unusual agitation, sweating or shivering should be reported.
- Care alongside other medicines that affect blood vessels or blood pressure.
Available as: Tablets, a nasal spray, and an injection (given under the skin) for fast relief or when nausea prevents swallowing tablets.
Answers
Sumatriptan: frequently asked questions
When in a migraine should I take sumatriptan?
Take it as soon as the headache itself begins — not during any aura or warning signs beforehand, when it is less effective, and not as a daily preventer. Treating the attack early, once the head pain starts, gives the best chance of stopping it. If you regularly miss that window, ask about other approaches.
It made my chest feel tight — is that dangerous?
A sense of tightness or heaviness in the chest, throat or limbs is a recognised triptan effect and is usually harmless, caused by mild, temporary tightening of blood vessels. However, because sumatriptan narrows blood vessels, severe or lasting chest pain should be taken seriously and checked urgently. Tell your prescriber if it happens, especially if you have any heart risk factors.
Can I take sumatriptan to prevent migraines?
No — sumatriptan treats an attack that has already started; it does not stop migraines from coming. If you are getting frequent attacks, the answer is not to take it more often (which risks medication-overuse headache) but to ask about preventive treatment, which is taken regularly to reduce how often migraines occur.
What is medication-overuse headache?
It is a persistent, often near-daily headache that develops when acute migraine medicines — including triptans like sumatriptan — are used on too many days each month. The treatment itself starts to drive the headache. Keeping triptan use to a limited number of days a month, and treating frequent migraines with prevention instead, helps avoid it. If you suspect it, see your GP.
What is the difference between sumatriptan and Imigran?
They are the same medicine — sumatriptan is the generic (active-ingredient) name and Imigran is a brand name. Generic sumatriptan contains the identical active ingredient and works in the same way, across the tablet, nasal spray and injection forms.
The wider class
About Triptans
Sumatriptan belongs to the triptans class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF: Sumatriptan.
- electronic Medicines Compendium (SmPC): Sumatriptan (Imigran).
- NICE CKS: Sumatriptan.
- NICE CKS: Migraine - acute treatment with triptans.
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