A person, such as a physician, who prescribes medication(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "prescriber" in a sentence
"Second Circuit Court of Appeals in Manhattan follows separate decisions by another appeals court in Boston upholding similar laws in New Hampshire and Maine that limit the use of so-called prescriber information."
"The normative claim of a sovereign to be the exclusive prescriber of laws has weakened in an age of interdependence, and the power to exclusively regulate within borders has declined."
"This business about Webster being a mere "compiler" rather than a "prescriber" is balderdash."