FDA's regulatory powers govern interstate distribution of drugs. State formularies can do as they choose to do within a State. That is how medical marijuana is allowed in many States and not subject to Federal Laws and FDA unless someone tries to ferry it over state lines.

NH can authorize tableters or capsule fillers at local compounding pharmacies to make ivermectin available to patients and healthy individuals inside of the State of NH without a prescription being required from a licensed medical practitioner.