Under federal law, what must be indicated on the labeling of a prescription drug?

Under federal law, prescription drug labeling must convey essential information regarding the safe and effective use of the medication. One of the key components of this labeling is a caution regarding dispensing the medication without a valid prescription. This helps ensure that the drug is used safely and that patients receive the appropriate healthcare provider oversight, which is critical in minimizing the risk of misuse or adverse effects.

Labeling that specifically cautions against dispensing the medication without a prescription serves to reinforce the regulatory framework that governs prescription drugs. It emphasizes that these medications are intended for use under the supervision of qualified healthcare professionals, thereby protecting public health.

Other options might pertain to important aspects of drug use and safety, but they do not have the same federal mandate concerning the labeling of prescription drugs as the caution about dispensing without a prescription. For instance, while it's important for pharmacists to verify doses, and warnings are crucial, those elements may not be required to be displayed directly on the drug label in the same way as the dispensing caution.