Eptoin Tablet contains Phenytoin 100 mg, an antiepileptic agent primarily used to control generalized tonic-clonic (grand mal) and complex partial seizures. Phenytoin stabilizes neuronal membranes and decreases seizure activity by promoting sodium efflux from neurons, thereby reducing repetitive firing of action potentials. It is indicated for the management of epilepsy, particularly in patients who do not respond adequately to other anticonvulsants. Eptoin is also utilized for the prevention and treatment of seizures occurring during neurosurgery or following head trauma. The tablet should be administered orally, with dosage individualized based on patient response and serum drug levels, typically ranging from 100 mg to 300 mg daily in divided doses. Common adverse effects include dizziness, ataxia, nystagmus, and gingival hyperplasia; serious reactions may involve hypersensitivity, hematologic abnormalities, or Stevens-Johnson syndrome. Regular monitoring of serum phenytoin concentration, liver function tests, and complete blood counts is recommended to ensure therapeutic efficacy and minimize toxicity. Caution is advised in patients with hepatic impairment, cardiac conditions, or those receiving other medications metabolized by the cytochrome P450 system due to potential drug interactions. Eptoin Tablet should be used under strict medical supervision with adherence to prescribed dosing schedules.