Tegretol is a brand name for the medication carbamazepine, which is primarily used to treat epilepsy and certain types of nerve pain, such as trigeminal neuralgia. It works by stabilizing electrical activity in the brain and reducing the frequency of seizures. Additionally, Tegretol may be prescribed for Bipolar disorder and some mood disorders. As with any medication, it is important to use it under the guidance of a healthcare professional due to potential side effects and interactions.