Hi, Epilive (sodium valproate) is an anticonvulsant medication that is commonly used to treat seizures and mood disorders. It can also be used to prevent migraines and treat bipolar disorder. In your case, Epilive is likely being used to prevent seizures following your radiosurgery for AVMs. The length of time you will need to take Epilive will depend on your case and the advice of your doctor. Generally, people with AVMs may need to take anticonvulsant medications for a few months to a few years, or possibly indefinitely. It is important to take Epilive exactly as prescribed by your doctor. Do not change your dosage or stop taking the medication without first consulting with your doctor. If you have any concerns or questions about your medication or dosage interval, be sure to discuss them with your doctor or pharmacist. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician