Pizotifen Tablets: Migraine Prevention Guide
Complete guide to pizotifen tablets for migraine prevention, dosage, and side effects.
About Pizotifen
Pizotifen is a medication used to prevent troublesome headaches, particularly migraines and recurrent throbbing headaches. It is also effective in treating cluster headaches, which are headaches that occur in close succession at certain times of the year, typically lasting between 6 to 12 weeks. Unlike pain relief medications that work during an active migraine attack, pizotifen is a preventative medication that must be taken regularly every day to be effective.
The medication is classified as an antimigraine medicine and works by modifying the body’s chemical responses that can trigger headaches. Pizotifen is available in tablet form in two different strengths: 500 micrograms and 1.5 mg.
| Medicine Detail | Information |
|---|---|
| Type of Medicine | Antimigraine medicine |
| Used For | Prevention of migraines and migraine-type headaches in adults and older children |
| Also Called | Pizotyline (in the US) |
| Available Strengths | 500 micrograms and 1.5 mg tablets |
| Method of Administration | Oral use only |
How Pizotifen Works
Your body produces certain chemicals that can be involved in causing headaches. These chemicals include serotonin, tryptamine, and histamine. Pizotifen helps to stop the effect of these chemicals by modifying the humoral mechanisms associated with headaches.
The medication works through several mechanisms: It inhibits the permeability-increasing effect of serotonin and histamine on cranial blood vessels, which helps prevent the transudation of plasmakinin and maintains the pain threshold of receptors at normal levels. Additionally, pizotifen inhibits serotonin reuptake by platelets, which helps maintain plasma serotonin levels and prevents the loss of tone and passive distension of extracranial arteries that can lead to migraine attacks.
Pizotifen is a tricyclic compound with strong antiserotoninergic and antitryptaminic properties, as well as antihistaminergic effects. It also possesses some antagonistic activity against kinins, though it has only weak anticholinergic action.
Uses of Pizotifen
Pizotifen is indicated for the prophylactic treatment of recurrent vascular headaches. This includes:
- Classical migraine
- Common migraine
- Cluster headache (periodic migrainous neuralgia)
- Recurrent throbbing headaches
The medication is designed for long-term prevention rather than acute treatment of active migraine attacks. If a migraine attack occurs despite taking pizotifen, you can still use painkillers or a triptan medicine to ease the pain and symptoms.
How to Take Pizotifen
Before starting treatment, it is important to read the manufacturer’s printed information leaflet from inside the medicine pack, as it provides detailed information about the medication and a comprehensive list of potential side effects.
Dosage Instructions:
- Take the tablets exactly as your doctor directs
- The usual starting dose is one 500 microgram tablet taken once daily at bedtime
- Your dose may be gradually increased to the usual maintenance dose of 1.5 mg daily
- The maintenance dose can be taken as a single daily dose at bedtime or divided into three smaller doses throughout the day
- Take the medication regularly every day for optimal effectiveness
It is crucial to maintain consistency in taking pizotifen daily, as it works to prevent headaches rather than treat them once they have started. The medication may not completely stop every migraine attack, but it should reduce the number and severity of your attacks.
Monitoring Your Progress
It is unlikely that pizotifen will stop your headaches completely. To monitor how well the medication is working for you, it may be helpful to keep a migraine diary. In this diary, note down:
- When each attack started
- Where the attack occurred
- What you were doing at the time
- What you had eaten that day
By maintaining a detailed migraine diary, a pattern may emerge that allows you to identify and avoid specific triggers for your attacks.
Side Effects of Pizotifen
Along with their useful effects, most medicines can cause unwanted side effects, although not everyone experiences them. The most common side effects of pizotifen are appetite-stimulating effects, increases in body weight, and drowsiness, including somnolence and fatigue.
Common Side Effects
- Drowsiness (including somnolence) – Feeling excessively sleepy or lethargic
- Dizziness – Experiencing lightheadedness or vertigo
- Nausea – Feeling sick or queasy
- Dry mouth – Reduced saliva production
- Fatigue – General weakness or tiredness
- Appetite stimulation – Increased desire to eat
- Increase in body weight – Weight gain resulting from increased appetite
Uncommon Side Effects
- Constipation
Rare Side Effects
- Paraesthesia (abnormal tingling or prickling sensations)
- Depression
- CNS stimulation (including aggression, agitation, restlessness, and excitability)
- Hallucinations
- Insomnia
- Anxiety
- Hypersensitivity reactions
- Face edema (swelling of the face)
- Urticaria (hives)
- Rash
- Myalgia (muscle pain)
- Arthralgia (joint pain)
Very Rare Side Effects
- Seizures
The unwanted effects often improve as your body adjusts to the new medicine, but you should speak with your doctor or pharmacist if any side effects continue or become troublesome.
Alcohol and Drowsiness Precautions
Pizotifen can cause sleepiness, and your doctor may recommend that you do not drink alcohol while taking the tablets, as alcohol will increase the drowsiness. Patients being treated with pizotifen and presenting with drowsiness, including somnolence and fatigue, must be instructed to refrain from driving or engaging in activities where impaired alertness may put themselves or others at risk.
Important Safety Information
Who Should Not Take Pizotifen
Pizotifen is contraindicated in patients with hypersensitivity to pizotifen or to any of its excipients. Additionally, it should not be used in patients with gastric outlet obstruction or angle-closure glaucoma.
Caution Required
Caution is required in several situations:
- Hepatic (liver) impairment: Pizotifen is extensively metabolized in the liver, and dosage adjustment may be necessary in patients with liver problems
- Renal (kidney) impairment: Dosage adjustment may be necessary in patients with kidney insufficiency
- Closed angle glaucoma: Although the anticholinergic activity of pizotifen is relatively weak, caution is required in the presence of this condition
- Urinary retention: Caution is needed in patients with a predisposition to urinary retention
- History of epilepsy: Pizotifen should be used with caution in patients with a history of seizures
Hepatic Safety
Hepatic injury, ranging from transaminase elevations to severe hepatitis, has been reported in patients taking pizotifen. Treatment should be discontinued immediately if there is any clinical evidence of hepatic dysfunction during treatment and until the cause of the liver abnormality is determined.
Withdrawal from Pizotifen
Acute withdrawal reactions have been reported following abrupt cessation of pizotifen, therefore gradual withdrawal is recommended. Withdrawal symptoms may include:
- Depression
- Tremor
- Nausea
- Anxiety
- Malaise
- Dizziness
- Sleep disorders
- Weight decrease
When discontinuing pizotifen, work with your healthcare provider to gradually reduce your dose rather than stopping abruptly.
Pharmacokinetics
Absorption of pizotifen in humans is fast, with an absorption half-life of 0.5 to 0.8 hours, and the absorption is nearly complete. The absolute bioavailability is 78%. Following a single 1 mg oral administration, the mean maximum plasma concentration reached approximately 5 ng/mL at 5.5 hours after administration.
When taken repeatedly at 1 mg three times daily for six days, the mean maximum plasma concentration at steady state was observed at 4 hours post-dose (14 ng/mL), with a mean trough plasma concentration of approximately 11 ng/mL.
Pizotifen is extensively metabolized in the liver and is primarily eliminated in the form of glucuronides in the urine.
Effectiveness in Clinical Practice
Various studies have shown pizotifen to be effective in the prophylaxis of migraines, reducing the frequency and severity of vascular headaches. However, some patients receiving pizotifen treatment have developed tolerance with prolonged use of the drug.
Beyond its antimigraine action, numerous studies have revealed the potential antidepressant effects of pizotifen, which are independent of its antimigraine action. While it is suggested that pizotifen may act similarly to classic tricyclic antidepressants, its full mechanism of antidepressant action is not fully elucidated.
Frequently Asked Questions
Q: How long does it take for pizotifen to work?
A: Pizotifen must be taken every day to help prevent migraine attacks from starting. It may take several weeks of regular use before you notice a significant reduction in the frequency or severity of your migraines. The exact timeframe varies from person to person.
Q: Can pizotifen be used to treat a migraine that has already started?
A: No, pizotifen is not effective in relieving a migraine attack that has already started. It is a preventative medication only. If a migraine occurs despite taking pizotifen, you can use painkillers or a triptan medicine to relieve the pain and symptoms.
Q: What should I do if I forget to take my pizotifen dose?
A: Take your next dose at the usual time. Do not take a double dose to make up for a missed dose. If you frequently forget doses, speak with your doctor or pharmacist about strategies to help you remember to take your medication regularly.
Q: Will pizotifen completely stop all my migraines?
A: It is unlikely that pizotifen will stop your headaches completely. However, the number and severity of your migraine attacks should reduce with regular use. The effectiveness varies from person to person.
Q: Is it safe to take pizotifen with alcohol?
A: Your doctor may recommend that you do not drink alcohol while taking pizotifen, as alcohol will increase the drowsiness caused by the medication. You should discuss alcohol consumption with your healthcare provider before starting treatment.
Q: What should I do if I experience side effects?
A: Many unwanted effects improve as your body adjusts to the medication. However, if any side effects continue or become troublesome, speak with your doctor or pharmacist. They can advise you on whether to continue the medication or adjust your dose.
Q: Can I stop taking pizotifen suddenly?
A: No, you should not stop taking pizotifen abruptly. Acute withdrawal reactions have been reported following abrupt cessation, so gradual withdrawal is recommended. Work with your healthcare provider to develop a plan to slowly reduce your dose when discontinuing the medication.
Q: Are there any alternatives to pizotifen for migraine prevention?
A: Yes, there are other medications used for migraine prevention, including gabapentin, calcium-channel blockers, lisinopril, and selective serotonin reuptake inhibitors (SSRIs). Your doctor can discuss which option is most suitable for your individual situation.
References
- Pizotifen 0.5mg Tablets – Summary of Product Characteristics — Medicines and Healthcare products Regulatory Agency (MHRA). 2025. https://www.medicines.org.uk/emc/product/13264/smpc
- Pizotifen – Migraine Prevention, Side Effects and Patient Advice — Patient.info. 2025-04-17. https://patient.info/medicine/pizotifen-tablets
- Pizotifen: Uses, Interactions, Mechanism of Action — DrugBank Online. https://go.drugbank.com/drugs/DB06153
- Migraine Treatment and Relief (Triptans) — Patient.info. https://patient.info/brain-nerves/migraine-leaflet/migraine-treatment-medication-and-prevention
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