Lamictal and Zonisamide together

Has anyone taken Lamictal and Zonisamide together? My daughter is nonverbal, autism and epilepsy and currently on both but i noticed a bluish tint to her lips, cyanotic?
There is literature about heart rhythm irregularities if on both, pharmacy confirmed..
Her epileptologist is aware but she's almost titrated to discontinue the Zonisamide in three weeks.. should i push to have it stopped now? She's on Coreg for blood pressure
Zonisamide led to severe constipation, impaction, hospitalization so not a good drug for her!!