Hi & Welcome.
It is not safe to take these medications together.
Benadryl (
Diphenhydramine) is an antihistamine used to treat allergic conditions like hives, itching and for the symptomatic relief of symptoms of
common cold is known to cause
drowsiness, dry mouth, increased heart beat,
constipation, blurring of the vision, etc as its side effects.
When taken along with Xanax it may increase side effects such as
dizziness, excessive drowsiness, confusion, and difficulty concentrating. It may also cause impairment in thinking, judgement, and motor coordination which may result in falls and injuries.
You may take Benadryl at bed time for the symptomatic relief of itching.
Hope these answer your query.