due to partial agenesis of corpus callosum
one of the most difficult to control,
as you have tried many antiepileptic as well as combination of newer drugs your doctor tried wysolone
because many less option left and wysolone is effective in 70% cases.
wysolone is a steroid
and long term use in such dose have definite adverse effect.so if seizure not improve after continuing wysolone for one month it should be discontinued.
you can try other antiepileptic in optimal dose and combination as well as diet modification which is helpful some time.
before switching the antiepileptic drug kindly get serum level of that drug to make sure drug is not working for your child
kindl get back to me if i am helpful to you, thanx