Epilepsy should be taken for at least 3 years before stopping the drug, epilepsy treatment has the principle of adequate dosage, long course of treatment, the patient after starting to use antiepileptic drugs, if the regular medication, there has been no clinical seizures, you can continue to take according to the original dose of 2.5-3 years.3 years, if there is no seizure, you can start to reduce the dosage, reduce the dosage of half a year, if there is still no seizure, the review of the electroencephalogram is normal, then you can stop, so the total duration of the drug So the total time is at least 3-3.5 years. If the patient has another seizure during the period of taking the drug or during the period of reducing the dosage, the time should be recalculated from the day of the seizure, and the drug should be taken again for 2.5-3 years. For patients who do not have seizures but are on medication for prevention, such as after surgery for traumatic brain injury, sometimes the neurosurgery department will give routine preventive medication, in which case the medication is only taken for about six months.