A drug or biologic can legally be prescribed for an off-label purpose once it has been approved by the FDA, even if the approval was for another purpose. It does not have to undergo further clinical trials to be legal, though clearly evidence-gathering is important and prudent. https://t.co/F0zesoxNLx

— Nan "MAGA Republican" Hayworth, M.D. (@NanHayworth) March 19, 2020