Mazetol 400 Tablet contains Carbamazepine 400 mg, an anticonvulsant and mood-stabilizing agent primarily used in the management of epilepsy, trigeminal neuralgia, and bipolar disorder. Carbamazepine acts by inhibiting voltage-gated sodium channels, thereby stabilizing hyperexcited neural membranes, reducing synaptic transmission, and preventing repetitive neuronal firing. This mechanism helps control partial and generalized tonic-clonic seizures and alleviates neuropathic pain associated with trigeminal neuralgia. Additionally, Carbamazepine is effective in the treatment of acute manic and mixed episodes in bipolar disorder. Mazetol 400 is typically administered orally, with dosage individualized based on clinical response and patient tolerance. Common adverse effects include dizziness, drowsiness, nausea, and ataxia, while serious but rare reactions may involve hematologic abnormalities, hepatic dysfunction, and hypersensitivity reactions such as Stevens-Johnson syndrome. Regular monitoring of blood counts, liver function tests, and serum drug levels is recommended during therapy. Caution is advised in patients with a history of bone marrow depression, cardiac conduction abnormalities, or hypersensitivity to tricyclic compounds. Mazetol 400 should be used under strict medical supervision to optimize therapeutic outcomes and minimize potential risks.