Grenil-F 10 Tablet contains Flunarizine 10 mg, a selective calcium channel blocker with antihistaminic properties, primarily indicated for the prophylaxis of migraine and management of vertigo associated with vestibular disorders. Flunarizine acts by inhibiting the influx of calcium ions into vascular smooth muscle and neuronal cells, thereby preventing vasospasm and stabilizing neuronal excitability. This pharmacological action reduces the frequency and severity of migraine attacks and alleviates symptoms of dizziness and imbalance in patients with vestibular dysfunction. Grenil-F 10 is typically administered orally once daily, with dosage adjustments based on clinical response and tolerability. It is contraindicated in patients with a history of depression, Parkinson’s disease, or severe hepatic impairment. Common adverse effects may include drowsiness, weight gain, and gastrointestinal disturbances, while rare but serious side effects such as extrapyramidal symptoms require prompt medical attention. Caution is advised when prescribing to elderly patients or those with comorbid conditions. Grenil-F 10 should be used under medical supervision, ensuring regular monitoring for efficacy and adverse reactions. It is important to inform healthcare providers of all concomitant medications to avoid potential drug interactions. This medication is not recommended during pregnancy or lactation unless clearly necessary.