An older ergot medicine for preventing severe migraine and cluster headache
Methysergide
An older ergot medicine used short-term, under specialist care, to prevent severe migraine and cluster headache.
What is Methysergide?
Methysergide is an older ergot-derived medicine used to help prevent severe migraine and cluster headache when other preventers have not worked. It is a preventer, not a treatment for an attack that has already started. Its most important risk is rare but serious scarring (fibrosis) around the lungs, heart and kidneys when it is used continuously, so it is given short-term with regular treatment breaks under specialist supervision. Because of this, it is used only when the benefit clearly outweighs the risk and with careful monitoring.
Education and reference only. This is a plain-language guide to Methysergide — 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
Methysergide is an older medicine derived from ergot, used to help prevent attacks of severe migraine and cluster headache in people for whom other preventive treatments have not worked well. It is a preventer taken regularly to reduce how often and how badly attacks happen, not something to take during an attack. Because of its potential for serious side effects, it is very much a specialist medicine, used in a particular way: in courses with planned breaks rather than continuously, and with monitoring. It is reserved for difficult cases under the care of a headache specialist.
How it works
Methysergide acts on serotonin pathways and blood vessels involved in migraine and cluster headache, which over time reduces the tendency to develop these severe attacks. Because it works as a preventer, it is taken regularly to lower the frequency and severity of attacks rather than to stop one that has already begun. The same actions that make it useful are linked to its serious risk: with continuous long-term use it can, rarely, cause scar tissue (fibrosis) to form around the lungs, heart and kidneys. To reduce this risk, it is given in courses with regular breaks rather than non-stop.
Company & origin
Originated / developed by: Specialist manufacturer.
An older specialist medicine used in the UK to help prevent severe migraine and cluster headache.
What it treats
Conditions Methysergide is used for
Practical use
How to take Methysergide
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it regularly as a preventer, exactly as your specialist directs, not during an attack.
- Follow the planned course-and-break pattern carefully, as treatment breaks lower the risk of scarring.
- Report any new breathlessness, chest, tummy, back or flank pain, or leg swelling promptly.
- Keep a separate treatment for stopping an attack that has already started.
- Do not take it with certain other migraine or ergot medicines unless your specialist says it is safe.
Weighing it up
Advantages & disadvantages of Methysergide
Advantages
- Can help prevent severe migraine and cluster headache when other preventers have not worked.
- Taken by mouth as a preventer to reduce how often and how badly attacks happen.
- A long-standing option for difficult headache under specialist care.
Disadvantages
- Rarely but seriously, continuous use can cause scarring (fibrosis) around the lungs, heart and kidneys.
- Must be used short-term with treatment breaks and close specialist monitoring.
- Does not treat an attack that has already started and interacts with other ergot and migraine medicines.
Practical use
Good to know
The defining issue with methysergide is the rare but serious risk of fibrosis, scarring that can develop around the lungs, heart or kidneys with continuous use. This is why it is never simply taken indefinitely: it is used in courses with planned treatment-free breaks, kept to short-term use where possible, and overseen by a specialist who monitors for early signs of fibrosis. Symptoms such as new breathlessness, chest or tummy pain, back or flank pain, or swelling of the legs should be reported promptly, as they can be warning signs. It is a preventer only, so a separate treatment is needed for an attack that has actually started. Because it comes from ergot, it is not combined with certain other migraine medicines and is avoided in various heart and circulation problems.
Who should not take it / use with caution
- People with significant heart, blood-vessel or circulation problems should not take it.
- People with existing fibrosis, or serious kidney or liver problems, should not take it.
- It is avoided in pregnancy and used only under specialist supervision with monitoring.
Monitoring
- Regular specialist review, with treatment breaks built into the course.
- Watching for early signs of fibrosis, such as breathlessness or back, chest or tummy pain.
- Checking kidney function and arranging scans or tests where appropriate.
Side effects
- Nausea, tummy upset, dizziness or drowsiness, especially early on.
- Cold or tingling hands and feet from its effect on blood vessels.
- Rarely but seriously, scarring (fibrosis) around the lungs, heart or kidneys with continuous use.
Key interactions
- It should not be combined with certain other ergot medicines or with triptans without specialist advice.
- Other medicines that affect serotonin or blood vessels may need to be reviewed.
- Tell your specialist about all your medicines so interactions can be avoided.
Available as: Tablets taken by mouth.
Answers
Methysergide: frequently asked questions
What is methysergide used for?
It is an older ergot medicine used to help prevent severe migraine and cluster headache when other preventers have not worked.
Can I take it during an attack?
No. It is a preventer taken regularly to reduce attacks; you need a separate treatment for an attack that has already started.
Why is it used only short-term?
Continuous use can rarely cause serious scarring (fibrosis) around the lungs, heart and kidneys, so it is given in courses with treatment breaks.
What warning signs should I report?
Report new breathlessness, chest, tummy, back or flank pain, or leg swelling promptly, as these can be early signs of fibrosis.
Why is it a specialist medicine?
Because of its serious potential side effects, it is used only under a headache specialist who monitors you and plans treatment breaks.
Authoritative sources
- BNF
- NICE CKS
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