A ditan to treat a migraine attack
Lasmiditan
An oral tablet taken during a migraine attack that works on serotonin without narrowing blood vessels.
What is Lasmiditan?
Lasmiditan (brand name Rayvow) is a newer oral medicine called a ditan, used to treat a migraine attack that has started. It works on a serotonin receptor in the brain (called 5-HT1F) to ease the attack, but importantly it does not narrow blood vessels the way triptans do. This makes it an option for some people who cannot take triptans because of heart or blood-vessel risks. It commonly causes dizziness and drowsiness, so you must not drive for several hours after a dose. It is an acute treatment only, not a preventer, and it is not recommended in pregnancy without advice.
Education and reference only. This is a plain-language guide to Lasmiditan — 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
Lasmiditan is a ditan, a newer type of tablet used to treat a migraine attack. It works on a serotonin receptor in the brain known as 5-HT1F to relieve the pain and other symptoms of an attack. It is an acute treatment, taken when a migraine starts, rather than a preventer taken regularly. What sets it apart is that, unlike triptans, it does not narrow blood vessels, which is why it can be considered for some people who must avoid that effect for heart-related reasons.
How it works
Lasmiditan acts on a specific serotonin receptor (5-HT1F) involved in migraine, calming the pain pathways without causing blood vessels to narrow. Triptans, the long-established acute migraine tablets, work partly by narrowing blood vessels, which is why they are avoided in some people with heart or circulation problems. Because lasmiditan does not do this, it offers an alternative for those people. It works on the attack in front of you and is not designed to prevent future migraines. A notable effect of how it works in the brain is that it commonly causes dizziness and drowsiness.
Company & origin
Originated / developed by: Eli Lilly.
A newer oral medicine used to treat a migraine attack, working on serotonin without narrowing blood vessels.
What it treats
Conditions Lasmiditan is used for
Practical use
How to take Lasmiditan
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take one tablet by mouth as soon as a migraine attack starts.
- Do not drive or operate machinery for several hours after a dose, as it commonly causes dizziness and drowsiness — plan to rest.
- Avoid alcohol around the time you take it, as this can add to the drowsiness.
- Use it only to treat attacks, not to prevent migraine, and avoid taking acute medicines on too many days to prevent medication-overuse headache.
- Tell your prescriber if you are pregnant, planning a pregnancy or breastfeeding, as it is not recommended without advice.
Weighing it up
Advantages & disadvantages of Lasmiditan
Advantages
- Treats a migraine attack without narrowing blood vessels.
- Can be an option for some people who cannot take triptans because of heart or blood-vessel risk.
- Offers a different way of working from both triptans and the gepants.
Disadvantages
- Commonly causes dizziness and drowsiness, so you must not drive for several hours after a dose.
- It is an acute treatment only and does not prevent migraine.
- Alcohol and other sedating medicines can add to the drowsiness, and it should not be overused.
Practical use
Good to know
The most important practical point is safety after a dose: lasmiditan commonly causes dizziness and drowsiness, so you must not drive or operate machinery for several hours after taking it — plan to rest afterwards. It is an acute treatment, taken during an attack, and is not used to prevent migraine. Its main advantage is that, unlike triptans, it does not narrow blood vessels, so it can be an option for some people who cannot take triptans because of heart or blood-vessel risk, though this should be confirmed with your prescriber. Avoid alcohol, which can add to the drowsiness, and do not combine it with other things that make you sleepy without advice. It should not be overused, and it is not recommended in pregnancy without advice.
Who should not take it / use with caution
- Anyone who needs to drive or operate machinery soon after a dose should not take it, because of dizziness and drowsiness.
- It is not recommended in pregnancy without advice, and should be discussed before planning a pregnancy or while breastfeeding.
- People who have had a serious allergic reaction to lasmiditan or its ingredients should not use it.
Monitoring
- Reviewing whether it relieves attacks and how it affects alertness and driving.
- Checking on how many days acute medicines are being used, to avoid overuse.
- Discussing pregnancy plans, breastfeeding and overall migraine control at review.
Side effects
- Dizziness and drowsiness are common, so plan to rest and do not drive for several hours.
- Some people get tingling, tiredness or nausea.
- Rarely, an allergic reaction such as rash or swelling can occur, which needs medical attention.
Key interactions
- Alcohol and other medicines that cause drowsiness can add to its sedating effect, so avoid combining without advice.
- It can interact with some medicines that affect serotonin or heart rhythm, so tell your prescriber what you take.
- Always mention other acute migraine treatments so overuse can be avoided.
Available as: Tablets taken by mouth.
Answers
Lasmiditan: frequently asked questions
Can I drive after taking lasmiditan?
No. It commonly causes dizziness and drowsiness, so you must not drive or operate machinery for several hours after a dose — plan to rest afterwards.
How is it different from triptans?
It works on a serotonin receptor without narrowing blood vessels, so it can be an option for some people who cannot take triptans for heart-related reasons.
Is it a preventer?
No. It is an acute treatment, taken during a migraine attack to relieve it, and is not used to prevent migraine.
Can I drink alcohol with it?
It is best avoided, as alcohol can add to the dizziness and drowsiness that lasmiditan commonly causes.
Is it safe in pregnancy?
It is not recommended in pregnancy without advice, so discuss it if you are pregnant, planning a pregnancy or breastfeeding.
Authoritative sources
- BNF
- NICE CKS
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