Flunarizine is a daily tablet taken to make migraines happen less often. It is not a painkiller for an attack already under way. It is a long-established first-choice preventive in many countries, though it is not sold in the United States.1PubMed Central. European Headache Federation (EHF) critical re-appraisal and meta-analysis of oral drugs in migraine prevention—part 2: flunarizine Its benefits come with a trade-off: everyday side effects like sleepiness on one side, and rarer effects on mood and movement on the other, which shape how long doctors let people stay on it.
How Well Flunarizine Prevents Migraines
Every placebo-controlled trial of 10 mg a day found fewer migraine attacks on flunarizine.2PubMed Central. European Headache Federation (EHF) critical re-appraisal and meta-analysis of oral drugs in migraine prevention—part 2: flunarizine Effects on how long or how bad each attack was were less consistent.3PubMed Central. European Headache Federation (EHF) critical re-appraisal and meta-analysis of oral drugs in migraine prevention—part 2: flunarizine The benefit shows most clearly in how often attacks come.4Health Canada. Product Monograph – Flunarizine Across trials it averaged about one fewer headache a month than a dummy pill.5PubMed Central. A Comparative Effectiveness Meta-Analysis of Drugs for the Prophylaxis of Migraine Headache For someone with six or eight migraines a month, that is a real but partial reduction, not a cure.
You take the tablet every day, whether or not your head hurts, and you still need your usual treatment for attacks that break through. Doctors judge success as roughly halving attacks, not stopping them. A headache diary is the simplest way to see whether it is working.
The drug is thought to block calcium and sodium channels on nerve cells, which calms overexcitable signalling in the brain and may make migraine aura harder to trigger. It also blocks histamine and dopamine signals, which helps explain the sleepiness and the movement side effects covered later.
Migraine frequency also rises and falls naturally from month to month, so judging the drug fairly takes several months of records. Counting your attack days before you start gives you a baseline, so a good or bad month is not mistaken for the drug’s effect. If the count has not dropped meaningfully by the review point, that is useful information for trying a different preventive.
Its effect is about the same as propranolol, a common blood-pressure drug used for migraine.6PubMed. Flunarizine as prophylaxis for episodic migraine: a systematic review with meta-analysis In a year-long trial, about two-thirds of people on flunarizine had their monthly headaches cut by more than half, similar to topiramate.7Pain Medicine. A Randomized, One-Year Clinical Trial Comparing the Efficacy of Topiramate, Flunarizine, and a Combination of Flunarizine and Topiramate in Migraine Prophylaxis Combining flunarizine and topiramate reduced headache days and severity more than either alone.8Pain Medicine. A Randomized, One-Year Clinical Trial Comparing the Efficacy of Topiramate, Flunarizine, and a Combination of Flunarizine and Topiramate in Migraine Prophylaxis In real-world use in the UK, only about 1 in 4 people reported no benefit.9PubMed. Flunarizine in migraine-related headache prevention: results from 200 patients treated in the UK If one preventive fails or causes problems, flunarizine is a reasonable equal-strength option.
People with low blood pressure or asthma are often steered away from propranolol, which can make flunarizine a practical alternative. Flunarizine’s own cautions are about mood and movement, so a history of depression points the other way.
How to Take It and How Long Treatment Lasts
The usual dose is 5 to 10 mg a day.10PubMed Central. European Headache Federation (EHF) critical re-appraisal and meta-analysis of oral drugs in migraine prevention—part 2: flunarizine For adults up to 65, the standard start is 10 mg daily, and it is stopped if there is no improvement after 2 months.11Vinmec. The use of Flunarizine Sleepiness is linked to higher drug levels in the blood,12PubMed. Flunarizine plasma concentrations and side effects in migraine patients so taking the tablet at bedtime, and using the lower dose in older people, can ease drowsiness.
If it works, maintenance includes 2 drug-free days every week.13National Institute for Health and Care Excellence. Migraine prophylaxis: flunarizine Some guidance lowers the maintenance dose to 5 mg alongside those breaks.14Vinmec. The use of Flunarizine 10 mg with weekends off worked at least as well as a full propranolol dose.15PubMed. Efficacy and tolerability in migraine prophylaxis of flunarizine in reduced doses: a comparison with propranolol 160 mg daily Treatment is usually stopped after 6 months and restarted only if migraines return.16National Institute for Health and Care Excellence. Migraine prophylaxis: flunarizine
These breaks exist because movement side effects grow with the total amount taken, as covered below. Time off lowers that total without losing benefit, and a pause tests whether you still need the drug at all.
Taking the tablet at about the same time each evening makes a missed dose easy to spot. If you miss one, take the next as usual rather than doubling up, since extra drug raises the sleepiness and the total amount. Build the drug-free days into your weekly routine, such as leaving out Saturday and Sunday, so they are planned rather than forgotten.
Common Side Effects Drowsiness and Weight Gain
Drowsiness or fatigue affects about 20% of people with migraine taking it, and weight gain or increased appetite affects about 15%.17Health Canada. Product Monograph – Flunarizine Still, fewer than 3 in 100 stop because of drowsiness, and about 1 in 100 because of weight.18Health Canada. Product Monograph – Flunarizine In one year-long trial, average weight gain was only 0.6 kg.19Pain Medicine. A Randomized, One-Year Clinical Trial Comparing the Efficacy of Topiramate, Flunarizine, and a Combination of Flunarizine and Topiramate in Migraine Prophylaxis Weight gain did not depend on how much drug was in the blood.20PubMed. Flunarizine plasma concentrations and side effects in migraine patients
The sleepiness usually shows up as feeling heavy or slowed in the morning and early afternoon, rather than sudden sleep attacks. Be careful driving until you know how the drug affects you, and remember that alcohol and other sedating medicines add to the drowsiness. If it persists, ask about the lower dose.
Some people quit in the first two weeks because of tiredness, sleepiness or stomach upset.21PubMed Central. Still Relevant, Still Effective: A Retrospective Observational Cohort Study on Real-Life Use of Flunarizine in Episodic Migraine Sleepiness often settles after the first fortnight. Sleepiness that gets worse over time, or comes with low mood, is worth reporting rather than pushing through.
For appetite, weigh yourself at the start and then monthly, and watch for snacking driven by a bigger appetite. Adding topiramate may offset weight gain.22Pain Medicine. A Randomized, One-Year Clinical Trial Comparing the Efficacy of Topiramate, Flunarizine, and a Combination of Flunarizine and Topiramate in Migraine Prophylaxis A steady gain is a reason to talk to your doctor, not to quietly stop.
Serious Risks Movement Problems and Depression
Flunarizine can cause parkinsonism, meaning Parkinson-like slowness, stiffness and tremor, plus restlessness or abnormal movements.23PubMed. Flunarizine- and cinnarizine-induced extrapyramidal reactions These have been seen mainly in older people, averaging about 69 years old.24PubMed. Movement disorders and depression due to flunarizine and cinnarizine Risk rises with a higher total amount taken, older age, heart disease, and especially a history of essential tremor.25PubMed Central. Flunarizine related movement disorders: a nationwide population-based study In a large national study, risk became noticeable after a total of about 585 mg, roughly two months at 10 mg a day.26PubMed Central. Flunarizine related movement disorders: a nationwide population-based study That figure marks where risk became noticeable, not a safe limit.
The problems tend to creep in over weeks to months, so they are easy to put down to age or tiredness. Because they can start subtly, the person taking the drug may be the last to notice, and family members often see the slowing first.
Nearly all people improve once the drug is stopped.27PubMed. Flunarizine- and cinnarizine-induced extrapyramidal reactions But in one group of older patients, about 1 in 4 still had lasting Parkinson-like slowness and stiffness a year or two later and needed Parkinson’s medicine.28PubMed. Flunarizine-induced parkinsonism in the elderly Catching early signs and stopping promptly matters.
Depression is one of its most serious side effects, causing about 1 in 75 trial patients to stop.29Health Canada. Product Monograph – Flunarizine Movement problems often come with depression.30PubMed. Movement disorders and depression due to flunarizine and cinnarizine In one reported case, low mood began after 8 weeks and lifted only after flunarizine was stopped.31Indian Journal of Private Psychiatry. Flunarizine-induced Depression: A Case Report with Review of Literature Any change in mood on long-term use should be reported.
Warning signs to watch for include slower walking, shuffling or a blank face, a new tremor of the hands or jaw, and inner restlessness or being unable to sit still. On the mood side, look for low mood, crying, loss of interest or poor sleep.
If any of these appear, contact your prescriber rather than waiting for the next review. Antidepressants alone may not fix drug-caused depression while flunarizine continues.
Who Should Not Take Flunarizine
It should not be used by anyone with a history of depression, nor by people with Parkinson’s disease or other movement disorders, nor by anyone allergic to it.32Journal of Pediatric Urology. FLUNARIZINE It is not recommended in pregnancy because safety data are lacking.33PubMed Central. Treating Vestibular Migraine When Pregnant and Postpartum: Progress, Challenges and Innovations It is processed mainly by the liver,34PubMed Central. Bioequivalence Study of Two Formulations of Flunarizine Hydrochloride Capsules in Healthy Chinese Subjects Under Fasting and Fed Conditions so mention any liver problems and all other medicines to your prescriber.
If you are planning a pregnancy, discuss stopping first. Long-term use needs regular mood checks.
Flunarizine for Children
About 57% of children and teens had their attacks at least halved, on 2.5 to 10 mg daily.35PubMed Central. Prophylactic Treatment of Pediatric Migraine: Is There Anything New in the Last Decade? Side effects affected about 1 in 5, including sedation, weight gain and depression.36PubMed Central. Prophylactic Treatment of Pediatric Migraine: Is There Anything New in the Last Decade? In a small trial, about half improved on flunarizine and about half on propranolol, but drowsiness was more common with flunarizine, 40% versus 15%.37PubMed Central. Flunarizine Versus Propranolol in Prophylaxis of Pediatric Migraine: An Open-Label Randomized Trial In one small group, improvement showed within 2 to 4 weeks, often at 5 mg.38PubMed. Flunarizine for prophylactic treatment of childhood migraine
Doctors usually consider it after simpler steps such as sleep, regular meals, hydration and trigger management. Doses in children are lower and set by a specialist, not scaled down from an adult tablet by guesswork.
Parents should watch for sleepiness affecting school, changes in mood or withdrawal, and changes in appetite and weight. A simple headache diary shows whether it is helping. A child with no change after a fair trial should be reassessed rather than kept on it indefinitely.
Vestibular and Hemiplegic Migraine
Vestibular migraine causes vertigo attacks rather than, or alongside, headache. They can bring spinning or rocking, unsteadiness and sensitivity to motion, sometimes with little or no headache. Episodes can last minutes to days, which makes them hard to recognise as migraine, and because the symptoms overlap with inner-ear problems, diagnosis usually depends on the pattern and history.
In a 12-week trial, flunarizine reduced how often and how badly vertigo struck.39PubMed Central. Current Treatment Options in Vestibular Migraine Over 8 months about 84% had their vertigo at least halved.40PubMed. Flunarizine and cinnarizine in the prophylaxis of vestibular migraine and migraine-associated menière’s disease: An 8-month retrospective study These come from limited studies, so the benefit is promising rather than guaranteed for you. In one clinic 90% reported improvement, though half had side effects and most continued.41PubMed Central. Patient Experience of Flunarizine for Vestibular Migraine: Single Centre Observational Study That was not a controlled comparison, so it likely overstates what to expect.
Hemiplegic migraine causes temporary one-sided weakness. In children, 85% with hemiplegic migraine responded versus 51% with other migraine.42PubMed. Safety and efficacy of flunarizine in childhood migraine: 11 years’ experience, with emphasis on its effect in hemiplegic migraine In UK practice it is often used for hemiplegic and chronic migraine.43PubMed. Flunarizine in migraine-related headache prevention: results from 200 patients treated in the UK