It's illegal for a prescriber to write an Rx outside of their usual practice.
It depends on whether it's within their prescribing authority.
For example, a dentist can give an antibiotic for an oral infection...but not an antifungal for a vaginal yeast infection due to the antibiotic.
A podiatrist can prescribe pain meds to treat injuries of the foot and ankle...but not a diuretic for ankle edema due to heart failure.
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