Carbamazepine is a white or almost white crystalline powder, which is a dibenzaza antiepileptic drug with similar antiepileptic effect as phenytoin sodium. It is most effective for psychomotor attack, and also effective for major attack, limited attack and mixed attack. Carbamazepine is better than phenytoin in the treatment of peripheral neuralgia, and can be used for trigeminal neuralgia and glossopharyngeal neuralgia. It can also be used in the treatment of arrhythmia and diabetes insipidus.