Flunarizine is a selective calcium entry blocker used in the prophylactic treatment of migraine and vestibular disorders.
Flunarizine belongs to a group of medicines known as calcium-channel blockers. It is taken to help prevent certain types of recurring headaches and to ease problems with balance or dizziness. In Hong Kong, you will find flunarizine as the active ingredient in products such as Sibelium and in generic tablets simply labelled Flunarizine.
The two main product names that contain flunarizine are:
Both products are oral tablets intended for regular use, and they may be supplied either with a prescription from a doctor or, in some cases, as a pharmacist-only medicine under Hong Kong’s Medicines and Poisons Ordinance. The tablets are stored at room temperature, protected from moisture.
Flunarizine is most commonly used for the following conditions:
These uses are approved by the Hong Kong Department of Health and reflect the main reasons doctors prescribe flunarizine. Some clinicians may consider it for other balance-related issues, but those decisions are made on an individual basis.
Flunarizine gently blocks the flow of calcium into certain cells in the brain and the inner ear. By doing so, it stabilises the nerves that trigger migraine pain and reduces abnormal signalling that can cause vertigo. The effect builds up over a few days, so the medication is usually taken every day rather than only when symptoms appear.
Most people notice only mild, short-lasting effects, such as:
These reactions often lessen as the body adjusts to the medicine.
Rarely, flunarizine can cause more serious problems. Seek immediate medical help if you experience:
These signs may indicate an allergic reaction or a rare neurological issue.
People with the following situations should discuss flunarizine with a health professional before using it:
Patients with a history of depression or Parkinson-like symptoms should also be monitored, as flunarizine can occasionally affect mood or movement.
Flunarizine may interact with certain other medicines and lifestyle factors:
Because interaction profiles can differ between the brand-name and generic forms, always check the specific product’s information leaf-let. Avoid driving or operating heavy machinery until you know how the medication affects you.
Store flunarizine tablets in a dry place, away from direct sunlight and out of reach of children. The typical course is for several weeks to months, depending on the condition being managed, but the exact duration is set by your prescriber. Remember that each product containing flunarizine-whether Sibelium or a generic version-may have slightly different instructions, so refer to the label that comes with your specific medicine. For full details on dosage, administration, and any special precautions, consult the information provided with your individual medication.
This article offers general educational information about flunarizine as an active substance used in various medicines. Its purpose is to help patients better understand the ingredient and the conditions it is used to treat. It is not a substitute for professional medical advice or for the specific instructions provided with individual products. Medicines containing flunarizine may differ in formulation, strength, and directions for use. Always consult the labeling of your particular medication and follow your healthcare provider’s guidance for complete information on proper use, dosage, and safety.
