He wasn't allowed them in the first fight, hopefully the dodgy commission who gave Wilder an extra 20 seconds to recover, allow Ortz to take his blood pressure meds in the rematch.
Will they give him a competitive edge in the fight? Then no he probably won't be allowed. Should you be a professional fighter if you require blood pressure meds? I am no doctor, but perhaps that is a no as well? I say all of this knowing 0.0 facts about blood pressure meds.