Which information is NOT required on a controlled prescription?

The required information on a controlled prescription is outlined by federal and state regulations, which specify what must be included to ensure the prescription is valid and can be processed appropriately. The information that is mandated includes the patient's name and address, the practitioner's DEA number, and both the date the prescription was written and the practitioner's signature.

In contrast, a patient's medical history is not a requirement on a controlled prescription. While medical history can be beneficial for the prescriber to consider when writing a prescription, it is not something that needs to be documented on the prescription itself. The focus of the prescription is to communicate specific details about the medication being prescribed, rather than the comprehensive medical background of the patient. Therefore, the reason "patient's medical history" is the correct answer lies in its absence from regulatory requirements for the information that must be included in a controlled prescription.