Which of the following is NOT included in the definition of a prescriber?

The correct choice is based on the definition of a prescriber within the context of pharmacy law. A prescriber is typically defined as a licensed healthcare professional who has the authority to prescribe medications. This includes various types of practitioners such as physicians, dentists, veterinarians, and other healthcare providers who have obtained the necessary licenses and credentials to prescribe medications legally.

The option indicating "someone who administers medications only" is not included in the definition of a prescriber because administering medication does not equate to prescribing it. A prescriber must have the specific authority to write prescriptions, while administering medication can be carried out by various healthcare professionals, such as nurses or pharmacists, without having the authority to prescribe. Therefore, this distinction underscores why the correct answer is someone who administers medications only, as they do not fulfill the role of a prescriber.