Sumatriptan

Sumatriptan tablets typically begin to take effect within 30 minutes of being taken, though some patients may notice treatment effects closer to 45 to 60 minutes. Peak concentrations of the active ingredient in the bloodstream are reached approximately 2 to 2.5 hours after taking the medication.

Sumatriptan has a half-life of around 2 hours, which means the concentration of the medication in the body halves every 2 hours. This is one of the shorter half-lives among the triptan class, which is why migraine symptoms can sometimes return within the same day, and a second dose may be needed at least 2 hours after the first dose.

Sumatriptan is available in two strengths: 50mg and 100mg.

Sumatriptan 50mg is the recommended starting dose for most patients. It is sufficient to relieve migraine symptoms for the majority of patients. It is suitable for those who are new to triptan medications, who may be more sensitive to side effects or who experience milder migraine attacks.

Sumatriptan 100mg may be considered for patients who have tried the 50mg dose across several migraine attacks and found it did not provide sufficient relief. The 100mg dose is taken as a single tablet in the same way as the 50mg dose.

Your prescriber will recommend the appropriate strength based on your medical history and previous experience with migraine treatments. It is generally advisable to start with the lower dose and only move to the higher strength if needed.

The maximum daily dose of Sumatriptan is 300mg in any 24-hour period.

• No more than six 50mg tablets in 24 hours, or
• No more than three 100mg tablets in 24 hours

For a single migraine attack, the usual maximum is two tablets taken at least 2 hours apart. Taking additional tablets within the same attack will not improve symptom relief and will increase the risk of side effects.

To reduce the risk of medication overuse headache, Sumatriptan should not be used on 10 or more days per month over an extended period. If you find you need Sumatriptan this frequently, speak to your GP about preventative migraine therapy.

If Sumatriptan is not helping relieve your migraine attacks, there are several factors worth considering before assuming the medication is not suitable.

• Timing of the dose: Sumatriptan tends to work best when taken as soon as the migraine headache starts. It should not usually be taken during the warning or aura stage before pain begins.
• Number of migraine attacks treated: It is generally recommended to try Sumatriptan across 2 to 3 separate migraine attacks before judging whether it is the right treatment for you, as individual responses may vary.
• Dose strength: If 50mg has not been sufficient across multiple attacks, your prescriber may consider the 100mg strength for future migraines.
• Switching triptan: Different triptans suit different people. If Sumatriptan does not work well, you may benefit from trying alternative triptan medication such as Rizatriptan or Zolmitriptan.
• Combining with analgesics: NHS guidance suggests that taking Sumatriptan alongside Paracetamol or Ibuprofen can improve symptom control for some patients. Always check with your prescriber before combining medications.

If you continue to experience poor migraine control despite trying these options, speak to your GP. There may be other treatment routes available, including newer migraine medications and preventative therapies.

Recommended reading: Expert Guide to Avoiding Migraine Triggers

Sumatriptan is suitable for most adults with a confirmed diagnosis of migraine, but it is not appropriate for everyone. Do not take Sumatriptan unless it has been confirmed as suitable for you by your GP, pharmacist or prescriber.

Do not take Sumatriptan and speak to your GP, pharmacist or prescriber if any of the following apply to your migraine symptoms:

• You have not previously been diagnosed with migraine by a doctor
• Your migraines do not follow a broadly similar pattern each time
• Your migraine symptoms have recently become much worse, more frequent, longer-lasting or different from usual
• Your headache is confined to the back of the head
• You have a recent rash with your headache
• Your migraines occur on more than 10 days per month
• Your untreated migraine attacks usually last less than 4 hours or longer than 24 hours
• You experience unusual migraine symptoms such as weakness on one side of the body, double vision, clumsiness, uncoordinated movements, ringing in the ears, reduced consciousness, difficulty speaking or seizure-like movements
• You have been told you have hemiplegic migraine, basilar migraine or ophthalmoplegic migraine

Recommended reading: What Types of Migraine Are There?

Do not take Sumatriptan and speak to your GP, pharmacist or prescriber if any of the following apply to your health:

• You are under 18 or over 65 years of age
• You have heart disease or heart problems, including narrowing of the arteries, angina, chest pain, coronary vasospasm, Prinzmetal’s angina, Wolff-Parkinson-White syndrome, irregular heartbeat or a previous heart attack
• You have had a stroke or transient ischaemic attack (TIA or “mini-stroke”)
• You have peripheral vascular disease or circulation problems in your legs
• You have uncontrolled high blood pressure or very high blood pressure
• You have had a previous gastrointestinal infarction, splenic infarction or ischaemic colitis
• You have liver problems or severe liver disease
• You have kidney problems
• You have epilepsy, seizures or any condition that lowers your seizure threshold
• You have ever had an allergic reaction to sumatriptan, Imigran, another triptan such as rizatriptan or zolmitriptan, or any of the ingredients in the tablet
• You have a known allergy or sensitivity to sulphonamide antibiotics or sulphonamide medicines
• You are pregnant, possibly pregnant, trying to become pregnant, breastfeeding or have recently given birth, unless Sumatriptan has been recommended by your GP or specialist
• You are a heavy smoker or use nicotine replacement therapy, especially if you are male and over 40 or have been through menopause
• You have risk factors for heart disease, such as diabetes, high cholesterol, high blood pressure, obesity or a strong family history of heart disease
• You have any serious medical condition that may require urgent medical attention or hospital care

Do not take Sumatriptan and speak to your GP, pharmacist or prescriber if you take or have recently taken any of the following medicines or substances:

• Ergotamine or medicines related to ergotamine, such as methysergide, that are used to treat migraine
• Another triptan used for migraine, such as rizatriptan, zolmitriptan, almotriptan, eletriptan, frovatriptan or naratriptan, within the last 24 hours
• Monoamine oxidase inhibitors (MAOIs), or if you have taken an MAOI in the last 2 weeks, such as moclobemide, phenelzine, isocarboxazid or tranylcypromine
• Selective serotonin reuptake inhibitors (SSRIs), such as citalopram, escitalopram, fluoxetine, fluvoxamine, paroxetine or sertraline
• Serotonin-noradrenaline reuptake inhibitors (SNRIs), such as duloxetine or venlafaxine
• Medicines that affect serotonin levels, such as lithium, tryptophan, reboxetine, flupentixol or selegiline
• St John’s wort, a herbal remedy sometimes used for low mood
• Cimetidine, used for indigestion or stomach ulcers
• Propranolol or other beta-blockers
• Current antibiotics, unless your prescriber has confirmed Sumatriptan is suitable for you
• Antifungal medicines such as ketoconazole or itraconazole
• The combined oral contraceptive pill, unless your prescriber has confirmed Sumatriptan is suitable for you
• Any other prescription, over-the-counter or recreational drugs that have not been reviewed by your prescriber

Do not take Sumatriptan at the same time as any other medicine for migraines unless a doctor or prescriber has told you to do so. If you are unsure whether your medication is safe to take with Sumatriptan, speak to your GP, pharmacist or prescriber.

Like all medicines, Sumatriptan can cause side effects, although not everyone gets them. Most side effects are mild and short-lived and usually settle without treatment.

Common side effects can include:

• Dizziness, drowsiness or feeling unusually tired
• Nausea or vomiting
• A warm or flushed feeling
• Tingling, numbness or pins and needles
• A feeling of heaviness, pressure, tightness or pain in parts of the body, including the chest or throat
• Shortness of breath
• Muscle aches or weakness

These symptoms are usually temporary. However, as chest tightness or pain can sometimes be difficult to distinguish from heart-related symptoms, you should seek urgent medical advice if your chest pain is severe, does not go away, spreads to your arm, back, neck or jaw, or is associated with shortness of breath, sweating, dizziness or feeling faint.

Rare but serious side effects - stop taking Sumatriptan and seek urgent medical help if you experience:

• Signs of a serious allergic reaction, such as swelling of the face, lips, tongue or throat, difficulty breathing, fainting or a widespread rash
• A seizure or fit
• Sudden severe chest pain, an irregular heartbeat or symptoms of a heart attack
• Sudden weakness or numbness on one side of the body, difficulty speaking, confusion, facial drooping or sudden vision changes
• Severe abdominal pain or bloody diarrhoea
• A severe or unusual headache that feels different from your usual migraine

If you experience side effects that are severe, persistent or worrying, stop taking Sumatriptan and speak to your GP, pharmacist or prescriber before taking another dose.

Yes. Sumatriptan and Imigran are medically identical. Both contain the same active ingredient (sumatriptan succinate) at the same strengths and produce the same effects on the body. The only difference between the two treatments is branding and price.

Imigran is the original branded version, first developed by GlaxoSmithKline. Sumatriptan is the generic version, which became available once the original patent expired and is offered at a lower price. Both are classified as selective serotonin (5-HT1) receptor agonists and are equally suitable for treating acute migraine attacks.

Sumatriptan is mostly available on prescription, but some 50mg sumatriptan products, such as Imigran Recovery or Migraitan, can be supplied from UK pharmacies after a pharmacist assessment.

Generic Sumatriptan is a prescription-only medicine in the UK for multiple reasons:

• Cardiovascular safety: Sumatriptan causes narrowing of blood vessels, including those supplying the heart. It is not suitable for people with a history of heart disease, stroke, angina, uncontrolled high blood pressure or other cardiovascular conditions.
• Requires a migraine diagnosis: Sumatriptan should only be used by people who have been diagnosed with migraine. Severe headaches with similar symptoms can sometimes have other causes that need to be ruled out by a clinician.
• Risk of medication overuse headache: Using Sumatriptan too often can make headaches more frequent or harder to control over time. Therefore, the 300mg daily limit helps reduce the risk of taking too much in one day, while the 10-day-per-month guidance helps reduce the risk of medication overuse headache from frequent use.

At Pharmica, the suitability of Sumatriptan is assessed by our prescribing team through a free online consultation before any order is approved and dispatched.

According to NHS guidance and the British National Formulary (BNF), Sumatriptan can generally be taken alongside common over-the-counter painkillers such as paracetamol or ibuprofen. There are no listed pharmacological interactions between these medications and Sumatriptan, and combining them may help with overall symptom control during a migraine attack.

You should always speak to a pharmacist or prescriber before taking any new medication alongside Sumatriptan, particularly if you have underlying liver, kidney or stomach conditions, or if you are taking other prescription treatments.

It is generally recommended to avoid alcohol while taking Sumatriptan. Alcohol can intensify common side effects of Sumatriptan, such as drowsiness or dizziness, and it is also a known migraine trigger for many people, which may make symptoms worse rather than better. If you do choose to drink, do so in moderation and stay hydrated.

There is limited safety data on the use of Sumatriptan during pregnancy, and migraine treatment choices during this period need to be assessed on an individual basis. If you are pregnant, think you may be pregnant, trying to become pregnant or have recently given birth, speak to your GP before taking Sumatriptan, as lifestyle adjustments and certain painkillers may be recommended first.

Small amounts of Sumatriptan can pass into breast milk. If your doctor or healthcare provider says your baby is healthy, Sumatriptan can usually be used while breastfeeding. However, to reduce any potential exposure to your baby, it may be recommended to avoid breastfeeding for around 12 hours after taking a dose. Always check with a pharmacist, GP or midwife before taking any medication while breastfeeding.

Sumatriptan is one of several triptan medications available in the UK. Other commonly used triptans include:

• Rizatriptan (Generic Maxalt): Available in 10mg tablets, Rizatriptan reaches peak blood concentrations more quickly than Sumatriptan (around 1 hour versus 2 to 2.5 hours), which can mean a faster onset of symptom relief for some patients. It is available as Generic Rizatriptan or as the branded Maxalt.
• Zolmitriptan (Zomig): A 2.5mg or 5mg tablet that targets the same 5-HT1B and 5-HT1D receptors as Sumatriptan. Zolmitriptan is also converted in the body into an active metabolite (N-desmethyl zolmitriptan), which extends its action on the serotonin receptors. It is available as Generic Zolmitriptan or as the branded Zomig.
• Frovatriptan: Has a longer half-life than Sumatriptan (around 26 hours) and is sometimes used for menstrual migraine because of its longer duration of action.
• Naratriptan: Has a slower onset but a longer duration of action, which can suit migraine attacks that build gradually.

Different triptans suit different people, and a treatment that does not work for one patient may work well for another. Newer migraine treatments known as gepants (such as rimegepant) work through a different mechanism and may be considered for people who cannot take triptans due to cardiovascular concerns. Always consult a pharmacist or your GP before switching between migraine treatments to ensure the alternative is suitable for your medical history.

The active ingredient in Sumatriptan tablets is sumatriptan succinate. Each tablet contains either 50mg or 100mg of sumatriptan, depending on the strength.

The other ingredients (excipients) include: lactose monohydrate, microcrystalline cellulose, croscarmellose sodium, magnesium stearate, hypromellose, titanium dioxide (E171) and triacetin. If you have a known allergy to any of these ingredients, including lactose intolerance, speak to a pharmacist before taking Sumatriptan. Always check the patient information leaflet supplied with your medication, as the excipients may vary depending on the brand.

Store Sumatriptan tablets at room temperature, below 30°C, in a dry place away from direct sunlight. Keep the tablets in their original packaging and keep them out of the sight and reach of children. Do not use Sumatriptan after the expiry date printed on the packaging.

• NHS: Sumatriptan. Information on how sumatriptan treats migraine and cluster headaches, how to take it, side effects, pregnancy, breastfeeding and interactions. [Accessed 30th June 2026]
• NHS: Migraine. Information on migraine symptoms, causes, triggers, diagnosis and treatment options. [Accessed 30th June 2026]
• NICE: Headaches in over 12s: diagnosis and management. Clinical guideline covering migraine diagnosis, red-flag symptoms, headache diaries, medication overuse and acute migraine treatment recommendations. [Accessed 30th June 2026]
• Electronic Medicines Compendium: Sumatriptan 50mg Tablets Patient Information Leaflet. Patient-facing information on how to take sumatriptan, when not to take it, side effects and storage. [Accessed 30th June 2026]