I Am Taking AURO- TOPIRAMATE 25 Mg For Epilepsy .

I am taking AURO- TOPIRAMATE 25 mg for epilepsy . Even after reducing the prescribed dosage by 1/2 I still suffer from extreme fatigue, memory problems etc. I have been on the drug for 2 months and tried several combinations and amounts After not taking the drug for a couple of days I get my strength back
I am 85 years of age and was in excellent shape before taking this drug. Should I insist on another form of medication.