Mazetol SR 400 Tablet contains Carbamazepine 400 mg, an anticonvulsant and mood-stabilizing agent primarily indicated for the management of epilepsy, trigeminal neuralgia, and bipolar disorder. Carbamazepine acts by reducing synaptic transmission in the central nervous system through the inhibition of voltage-gated sodium channels, thereby stabilizing hyperexcited nerve membranes and preventing repetitive neuronal firing. Mazetol SR 400 is a sustained-release formulation designed to maintain steady plasma drug concentrations, improving therapeutic efficacy and minimizing side effects associated with peak-trough fluctuations. It is commonly prescribed for partial seizures with complex symptomatology, generalized tonic-clonic seizures, and mixed seizure patterns. Additionally, it is effective in alleviating neuropathic pain and stabilizing mood in patients with bipolar affective disorder. Dosage should be individualized based on clinical response and serum drug levels, with careful titration to minimize adverse effects such as dizziness, drowsiness, nausea, and hyponatremia. Regular monitoring of hematologic parameters, liver function, and serum carbamazepine levels is recommended to detect potential toxicity or hypersensitivity reactions. Mazetol SR 400 should be used cautiously in patients with a history of bone marrow depression, cardiac conduction abnormalities, or hepatic impairment. Concomitant use with other central nervous system depressants requires medical supervision.