DOES DEXAMETHASONE CAUSE SEIZURES?

MY SON IS 11YRS OLD AND HE HAS SLE HIS IS OF HIS KIDNEY'S HE FIRST STARTED OFF WITH PREDNISONE NOW HE'S GETTING THE INJECTIONS DAILY JUST RECENTLY HE STARTED HAVING SEIZURES. AND I BELIEVE IT'S FROM THE INJECTIONS THEY TESTED HIM FOR CEREBRITIS LUPUS BUT ALL HIS TEST RESULTS WERE NORMAL . SO THE ONLY THING I CAN THINK OF IS THE INJECTIONS. KEEP IN MIND HE'S ONLY ELEVEN HE TAKES :
DEXAMETHASONE 0.5ML DAILY IM
ENALIPRIL 5MG
NORVASC 2.5MG
PLAQUENIL 200MG
NEXIUM 20MG
HE ALSO HAS CYTOXIN EVERY THREE MONTHS.

PLEASE IF SOMEONE CAN GIVE ME SOME ANSWERS I AM VERY WORRIED!! I CONTACTED ANOTHER HOSPITAL SO I CAN TRY TO GET A SECOND OPINION.

THANK YOU ELENA H