Which of the following is a characteristic of prescription drugs?

Prescription drugs are indeed characterized by the need for a healthcare provider’s approval. This requirement is in place primarily to ensure patient safety, as these medications can have significant effects on the body and may require close monitoring or specific instructions for use. Healthcare providers evaluate a patient’s medical history, current conditions, and potential drug interactions before prescribing these medications to ensure that the benefits outweigh any risks.

The other options provide context as to why they do not accurately represent the characteristics of prescription drugs. For instance, while prescription drugs can often be more expensive than over-the-counter (OTC) drugs, this is not universally true, and cost does not define their classification. Additionally, prescription drugs cannot be purchased freely; they require a written or electronic prescription from a qualified healthcare professional. Lastly, the assertion that they have no side effects is misleading, as all medications, including prescription drugs, can have potential side effects and may affect individuals differently. This reinforces the necessity for professional oversight in their use.