99% EP Standard Flunarizine HCl CAS 30484-77-6 Pharmacy Grade

Flunarizine  More Info

Flunarizine dihydrochloride is the salt form of flunarizine, a difluorinated derivative of cinnarizine belonging to the class of selective calcium channel blockers. Developed initially as a vascular agent, this compound exhibits both calcium channel antagonism and histamine H1 receptor blocking activity. The dihydrochloride salt formulation was created to enhance the compound's stability, water solubility, and bioavailability for pharmaceutical use. Its unique mechanism involves selective inhibition of calcium influx into vascular smooth muscle and neuronal cells without significantly affecting cardiac conduction. The fluorinated molecular structure contributes to its prolonged duration of action and distinct pharmacological profile compared to non-fluorinated analogs, enabling once-daily dosing in clinical practice.

Uses and Applications

The primary clinical applications of flunarizine dihydrochloride include migraine prophylaxis and management of vestibular disorders. It is particularly effective in reducing the frequency and severity of migraine attacks through its dual action on cerebral vasculature and neuronal calcium channels. Additional therapeutic uses encompass vertigo management, peripheral vascular disorders, and as adjunctive therapy in certain seizure disorders. The medication is typically administered orally in tablet form, with dosage titration based on individual patient response and specific indication. Its long elimination half-life permits once-daily administration, supporting patient compliance in chronic conditions requiring prolonged therapy. The compound's multifunctional pharmacological profile makes it particularly valuable for patients with mixed vascular and neurological symptoms.

Application Market

The market for flunarizine dihydrochloride is well-established within the neurology and cardiovascular pharmaceutical sectors, with significant regional variation in prescribing patterns. The compound maintains particularly strong market presence in European, Asian, and Latin American markets where it has been extensively studied and incorporated into treatment guidelines. As a generic medication, it is manufactured by multiple pharmaceutical companies and is available in various dosage strengths. Market distribution occurs primarily through retail pharmacies and hospital formularies, with neurologists and otolaryngologists being the main prescribers. Despite the introduction of newer migraine prophylactic agents, flunarizine maintains its market position due to proven efficacy, cost-effectiveness, and extensive clinical experience spanning several decades.

Important Considerations

Clinical use of flunarizine dihydrochloride requires careful patient selection and monitoring due to its characteristic adverse effect profile. The most significant concern involves extrapyramidal symptoms including parkinsonism, tremor, and akathisia, which may occur particularly in elderly patients and with long-term treatment. Additional important adverse effects include weight gain, drowsiness, and depression, necessitating regular assessment during therapy. Contraindications include pre-existing parkinsonism, depression, and hepatic impairment. Drug interactions may occur with other central nervous system depressants and medications that prolong QT interval. Patients should be advised regarding potential impairment of alertness and the need to avoid activities requiring mental alertness during initial treatment. Regular follow-up is recommended to assess therapeutic response and monitor for emerging adverse effects, with particular attention to neurological symptoms during extended therapy.

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