Which of the following must be included on a prescription for a controlled substance?

A prescription for a controlled substance must include specific information to ensure it is valid and in compliance with legal requirements. One of the critical components is the patient's address. This information is essential because it helps to identify the patient and ensures that the medication is being prescribed to the correct individual. Including the address also assists in maintaining accurate records for monitoring prescriptions and preventing misuse or diversion of controlled substances.

While phone numbers, ages, and insurance information may be useful, they are not mandatory elements on a prescription for controlled substances under federal regulations. The primary aim of requiring the patient's address is to promote safe prescribing practices and enhance the tracking of prescriptions for controlled substances.