Trade names Sibelium Routes of
administration Oral Molar mass 404.495 g/mol | Pregnancy
category C ATC code N07CA03 (WHO) CAS ID 52468-60-7 | |
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AHFS/Drugs.com Micromedex Detailed Consumer Information Legal status In general: ℞ (Prescription only) | ||
Flunarizine (trade name Sibelium and many others) is a drug classified as a calcium antagonist. It is effective in the prophylaxis of migraine, occlusive peripheral vascular disease, vertigo of central and peripheral origin, and as an adjuvant in the therapy of epilepsy. It has been shown to significantly reduce headache frequency and severity in both adults and children.
Contents
Flunarizine is not available by prescription in the U.S. or Japan. It was discovered at Janssen Pharmaceutica in 1968.
Contraindications
Flunarizine is contraindicated in patients with depression, in the acute phase of a stroke, and in patients with extrapyramidal symptoms or Parkinson's disease. It is also contraindicated in hypotension, heart failure and arrhythmia.
Side effects
Common side effects include drowsiness (20% of patients), weight gain (10%), as well as extrapyramidal effects and depression in elderly patients.
Interactions
The effects of other sedating drugs and alcohol, as well as antihypertensives, can be increased. No relevant pharmacokinetic interactions have been described.
Mechanism of action
Flunarizine is a non-selective calcium antagonist with moderate other actions including antihistamine, serotonin receptor blocking and dopamine D2 blocking activity. Compared to other calcium channel blockers such as dihydropyridine derivatives, verapamil and diltiazem, flunarizine has low affinity to voltage-dependent calcium channels. It has been theorised that it may act not by inhibiting calcium entry into cells, but rather by an intracellular mechanism such as antagonising calmodulin, a calcium binding protein.
Pharmacokinetics
Flunarizine is well absorbed (>80%) from the gut and reaches maximal blood plasma concentrations after two to four hours, with more than 99% of the substance bound to plasma proteins. It readily passes the blood–brain barrier. When given daily, a steady state is reached after five to eight weeks. Concentrations in the brain are about ten times higher than in the plasma.
The substance is metabolised in the liver, mainly by the enzyme CYP2D6. At least 15 different metabolites are described, including (in animals) N-desalkyl and hydroxy derivatives and glucuronides. Less than 1% is excreted in unchanged form, and the main excretion path is via bile and faeces. Elimination half life varies widely between individuals and is about 5 to 15 hours after a single dose, and 18 to 19 days on average when given daily.
Research
Flunarizine may help to reduce the severity and duration of attacks of paralysis associated with the more serious form of alternating hemiplegia, as well as being effective in rapid onset dystonia-parkinsonism (RDP). Both these conditions arise from specific mutations in the ATP1A3 gene.