seizures
"I was diagnosed with epilepsy when I was 23.  I am now 35 I was put on Tegretol 500mg twice a day.  For 2 years my life was a nightmare I still got seizures and double vision everyday.  I was then prescribed 500mg of Keppra twice daily along with the Tegretol.  The double vision went completely and I found that I only have 1 or 2 seizures max a year, this is usually because of lack of sleep or forgetting to take my medicines.  Yes I find my attention span is not great sometimes along with tiredness and mood swings.  The positives for me outweigh the negatives.  Good luck in finding what suits you best."