Hi. I echo what you've said here. As an epileptic and under control with Tegretol and now Lamictal, I only use Viagra which doesn't bother me seizure-wise and I have my doctor's blessing because some anticonvulsants do have the side effect of causing some degree of ED.
I haven't had a seizure for 20 years and, as Cinemagic says, one doesn't really know what the quantity of the actual active ingredient is in herbal medications.
So, please don't take anything without seeing your doctor first as I know you wouldn't want to be driving that nice car down the street, have a seizure and kill yourself or a dozen others.
Thanks & take care......