According to FDA.org, once the FDA approves a drug, healthcare providers generally may prescribe the drug for an unapproved use when they judge that it is medically appropriate for their patient. One reason to prescribe a drug “off-label” is that there might not be an approved drug to treat your disease or medical condition. Another is that you may have tried all approved treatments without seeing any benefits.  In situations like these, you and your healthcare provider may talk about using an approved drug for an unapproved use to treat your disease or medical condition.