Hi, Thank you for posting your query. It is an important question, and one has to find out the cause of seizures, to decide how long to give the seizure medications. Common investigations required to determine the cause of seizures are MRI brain-epilepsy protocol and electroencephalogram (EEG). If both are normal and there is no family history of epilepsy, then, it is labeled as cryptogenic epilepsy. In these cases, at least three seizure free years are required before we can stop the seizure drugs. The drug should be gradually reduced and stopped and not all of a sudden. Regular follow up and review with the doctor is necessary to monitor the efficacy and safety of drugs. I hope it helps. Please get back if you require any further information. Best wishes, Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology) Senior Consultant Neurologist Apollo Hospitals, Hyderabad, For DIRECT QUERY to me: http://bit.ly/Dr-Sudhir-kumar My blog: http://bestneurodoctor.blogspot.com/