I have been taking 0.25mg of Xanax once per day before sleep for the past 4 months due to Concussion issues. I want to stop taking it soon so i was wondering if tapering off is necessary in this case?

Also kinda offtopic i just started taking Dexamethasone today so i was wondering if there are any interactions between Xanax and Dexamethasone?

Thanks in the front