Hi,
Eptoin contains phenytoin is used in the treatment and prevention of epilepsy or seizures. By reducing the abnormal activities of the nerve cells in the brain, it can control seizures. Long term use of Eptoin may cause some side effects like overgrowth of the gums or 
gingival hyperplasia, 
excessive hair growth on the body or face, acnes, coarseness of facial features, weakening of the bones, 
bone marrow suppression, liver problems etc. You should take this medication as in doses and duration as advised by your doctor.
Encorate Chrono contains 
sodium valproate which belongs to the group of medications known as antiepiletic medications is used in the treatment and prevention of epilepsy or seizures. Long term use of Encorate Chrono may cause some effects such as 
osteoporosis, weight gain, gum swelling, tremor, hair loss, liver  injury, suicidal thoughts etc. This medication should be taken as long and as directed by your doctor.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Zubayer Alam, General And Family Physician,