Hi, These medications all have numerous side effects that must be balanced against the potential good they are producing. All can cause fatigue, lethargy, slurred speech, and generalized weakness if doses are high or if interactions between medications also occur. There are also side effects having to do with stomach upset and burning sensations in the stomach. Another important side of these medications is imbalance or loss of balance while standing or walking. These medications must be continued according to the patient s doctor s instructions and often when the cause is not known as to why the first seizures occurred then, we require these medications to be used for a minimum of 2 years and ask the patient to keep a daily journal of any and all events that can be checked with the doctor at each visit. Sometimes, if the cause of the seizure is known such as bleed in the brain, traumatic brain injury, or penetrating projectile into the brain, or even something like tumor which must be taken out surgically--- then, medication may be life long. You must check with the doctor prescribing the medication to find out what they re thinking. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Dariush Saghafi, Neurologist