Which of the following is a requirement for a valid prescription?

A valid prescription must contain specific essential elements to ensure that it meets legal and safety standards. One of the key requirements is the inclusion of the patient's full name and address. This information is necessary for several reasons: it helps to identify the patient receiving the medication, ensures that the correct person is receiving the treatment, and allows for proper record-keeping by the pharmacy. Including the full name and address also aids in verifying the identity of the patient in case of any disputes or complications related to the prescription.

While the pharmacy's phone number is important for pharmacy operations and communication, it is not a necessary component of a prescription itself. The doctor's favorite medication has no relevance in ensuring the prescription's validity and is not a requirement. Similarly, although understanding a patient’s insurance details is helpful for billing purposes, it is not required on a prescription to make it valid. Thus, the patient's full name and address is the only choice that meets the criteria for a valid prescription.