my son is almost 15,he s epileptic and takes keppra. he has developed urinary incontinence during the day. he just started keppra 3 mos. ago, could it be related to the med, or is there something else going on. he does not show any signs of seizure activity when this happens, usually he is laughing, but says he does not feel the urge and can t stop once he starts. very frustrating.