Okla. Admin. Code § 510:5-3-2
The following words or terms, when used in this Subchapter, shall have the following meaning, unless the context clearly indicates otherwise:
"Drugs" means any dangerous, legend, or prescription drug intended for use by a person which, because of its toxicity or other potentiality for harmful effects, or the method of its use, or the collateral measures necessary for its use, is not safe for use except under the supervision of a practitioner licensed to administer such drugs. This shall include all drugs upon which the manufacturer or distributor has, in compliance with federal law and regulations, placed the following: "Caution-Federal Law prohibits dispensing without prescription".
"Licensed practitioner" means an Osteopathic Physician and Surgeon licensed to practice and authorized to prescribe medication within the scope of their practice.
"Professional samples" means a free pre-packaged quantity of drugs in accordance with federal and state statutes and regulations that are provided to a licensed practitioner at no cost and appropriately distributed in the same package by the licensed practitioner to his patients.
Okla. Admin. Code § 510:5-3-2