What Causes Swelling From Knee To Foot While On Eptoin For Seizures?

I have seizures first when I'm at the age of 12 after taking 2 years of treatment I stopped .Den again 4 back seizures attack I started with medication celitoin 300 mg last year by reducing dosage as per doctor suggestion I stopped it . But again it has been repeated last month now I'm taking eptoin 100 mg 3 tablets a day .Now I'm an 25 year old . From knee to foot swelling is their. I have undergone for CSF analysis also .