I am a 30 years male I am taking medicine for seizure disorder for the past 15 Years but continuously only for the past 3 years 6 Months. My Neuro consultant told me that I have to take medicine continuously for 3 years I am had took Valparin chrono 500 mg for the past 3 years and after 3 yrs he reduced to 300 mg tablets on my next visit he told me that I have to take medicines again for 3 years I can't understand why he told like that even after 3 years Kindly anyone guide me what is cause for this.