Part of the Access Doctor migraine treatment guide. Conditions overview: migraine & headache UK.
Sumatriptan for Migraine: How It Works, Doses & Online UK Prescription
Clinically reviewed guide to sumatriptan — mechanism, available forms, 50mg vs 100mg dosing, side effects, contraindications, and how to get a prescription online in the UK.
▶ Sumatriptan at a glance
Sumatriptan is a 5-HT1B/1D receptor agonist (triptan) — the most widely prescribed acute migraine treatment in the UK. It constricts dilated cranial blood vessels and blocks trigeminal pain pathways. Available as 50mg and 100mg oral tablets, nasal spray, and auto-injector. Onset 30–60 minutes orally. Prescription-only. GPhC pharmacy #9011198.
50mg
Standard starting dose (100mg available)
~14%
Oral bioavailability
30–60m
Time to onset of effect
2h
Repeat dose interval if needed
How Sumatriptan Works
Sumatriptan is a 5-HT1B/1D receptor agonist — it acts on serotonin receptors on cranial blood vessels and trigeminal nerve terminals. This produces two key effects during a migraine attack:
- Vasoconstriction — constricts dilated cranial blood vessels, reversing the vascular component of migraine pain
- Trigeminal pain pathway blockade — inhibits the release of inflammatory neuropeptides (including CGRP and substance P) from trigeminal nerve endings, blocking the central pain signal
Sumatriptan is specifically designed for migraine — it does not work for tension headache or other headache types. It treats the attack but does not prevent future attacks. For attack prevention, see migraine prevention.
Important: Sumatriptan should be taken at headache onset, not during the aura phase. Taking it during aura does not improve efficacy and may not be appropriate. Wait for the headache to begin before dosing.
Available Forms in the UK
| Form | Doses | Notes |
|---|---|---|
| Sumatriptan tablets | 50mg, 100mg | Most widely used; onset 30–60 minutes. Take as soon as headache starts. |
| Imigran nasal spray | 10mg, 20mg | Useful if nausea prevents swallowing. Onset 15–30 minutes. |
| Subcutaneous injection | 6mg | Fastest onset (10–15 minutes); for severe attacks or vomiting preventing oral dosing. Self-administered via auto-injector. |
Dosing (oral tablets)
| Situation | Dose | Notes |
|---|---|---|
| First dose at headache onset | 50mg (some patients require 100mg) | Do not take during aura. Take with water. |
| Repeat dose if headache returns | 50mg after at least 2 hours | Only if the first dose produced initial relief. If first dose had no effect, a second dose in the same attack is unlikely to help. |
| Maximum in 24 hours | 300mg (oral) | Do not exceed. Do not take a second dose if the first had no effect. |
Propranolol interaction: If you are taking propranolol for migraine prevention, sumatriptan can still be used but maximum doses may need adjustment. Rizatriptan (another triptan) has a specific dose reduction requirement with propranolol — use 5mg instead of 10mg. Discuss with your prescriber.
Side Effects
Sumatriptan is generally well tolerated at recommended doses. Common side effects include:
- Tingling, warmth, or flushing in the face, chest, or limbs — typically transient and harmless
- Heaviness or tightness in the chest or throat — usually muscular, not cardiac, but tell your prescriber if it persists
- Drowsiness or dizziness
- Nausea (less common with nasal spray and injection routes)
Stop and seek emergency care if you experience: chest pain or pressure radiating to the arm or jaw · sudden severe weakness, numbness, or vision changes · signs of serotonin syndrome (agitation, confusion, rapid heart rate, high temperature). These are rare but require immediate attention.
Who Should Not Take Sumatriptan
- Ischaemic heart disease or history of myocardial infarction
- Uncontrolled hypertension
- Stroke or TIA history
- Basilar migraine or hemiplegic migraine — triptans are contraindicated
- Concurrent MAOIs or within 2 weeks of stopping
- Prinzmetal’s angina
- Severe hepatic impairment
Get Sumatriptan Prescribed Online
Answer a short questionnaire. Our GPhC-registered prescribers assess your suitability for sumatriptan and dispatch discreetly. Next-day delivery. GPhC pharmacy #9011198.
Request Sumatriptan Prescription →Which Triptan Is Right for You?
Sumatriptan is the most studied and widely prescribed triptan, but it is not the only option. If sumatriptan does not provide adequate relief, or if you need a faster-acting alternative, rizatriptan (Maxalt) or zolmitriptan (Zomig) may suit you better. The choice depends on onset speed preference, nausea severity, whether you take propranolol, and individual response — which varies considerably between patients.
For a full head-to-head comparison of sumatriptan, rizatriptan and zolmitriptan across all key properties, see: Triptans for migraine UK: full comparison guide →
Frequently Asked Questions
What is sumatriptan used for?
Sumatriptan is prescribed for the acute treatment of moderate to severe migraine attacks. It does not prevent migraines — it treats an attack once it has started. It is not effective for tension headache.
What is the correct dose of sumatriptan?
The standard starting dose is 50mg orally at headache onset. If 50mg is insufficient, your prescriber may recommend 100mg. A repeat dose of 50mg can be taken at least 2 hours after the first if the headache returns. Maximum 300mg in 24 hours.
When should I take sumatriptan?
Take sumatriptan at headache onset — not during the aura phase. Taking it early in the headache phase produces the best response. Do not take a second dose in the same attack if the first dose had no effect.
Can I take sumatriptan if I have migraine with aura?
Sumatriptan can be used in migraine with aura but should be taken at headache onset, not during the aura itself. Triptans are contraindicated in basilar and hemiplegic migraine specifically. Discuss with your prescriber.
What is the difference between sumatriptan and rizatriptan?
Both are triptans but rizatriptan has higher oral bioavailability (~45% vs ~14%) and faster onset (~30 minutes vs 30–60 minutes). Some patients respond better to one than the other. If sumatriptan is not sufficiently effective, rizatriptan is a reasonable alternative to try.
References
- NICE. Headaches in over 12s: diagnosis and management. CG150. 2012 (updated 2021).
- Ferrari MD et al. Oral triptans (serotonin 5-HT1B/1D agonists) in acute migraine treatment. Lancet. 2001.
- NHS. Sumatriptan. nhs.uk/medicines/sumatriptan
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Prescription migraine treatments require a clinical consultation. Always consult a qualified healthcare professional. In a medical emergency, call 999.