What did the Durham-Humphrey Amendment of 1951 require for all prescription drugs?

The Durham-Humphrey Amendment of 1951 established a clear distinction between prescription and over-the-counter (OTC) drugs, setting forth specific labeling requirements for prescription medications. The correct choice emphasizes that all prescription drugs must be labeled with the statement "Caution: Federal law prohibits dispensing without a prescription." This label serves to inform consumers and healthcare professionals that these medications cannot be obtained legally without a valid prescription from a licensed practitioner.

This requirement enhances patient safety by ensuring that certain medications, which may have significant side effects or the potential for misuse, are dispensed only when prescribed by a qualified healthcare provider. It also provides a warning to those handling the medications, reinforcing the legal accountability surrounding prescription drugs.

The other options do not align with the requirements set forth by the Durham-Humphrey Amendment. For instance, stating that all prescription drugs must be available over-the-counter is contrary to the purpose of the amendment, which is to regulate access to prescription medications. Similarly, the suggestion that a doctor's presence at the pharmacy is necessary or that drugs must feature a specific logo does not reflect the actual stipulations outlined in the amendment.