Not so in the US. Doctors commonly prescribe drugs for off-label use. They are legally allowed to and don't need the government's permission. Insurance companie

Not so in the US. Doctors commonly prescribe drugs for off-label use. They are legally allowed to and don't need the government's permission. Insurance companies might not cover it, the doctor's employer might not allow it, and if something goes wrong, they might be sued, and their malpractice insurance coverage might be canceled, but the practice is widespread, legal, and ethical. There are just limits and risks to consider.