Why are prescriptions necessary for patients to obtain certain drugs?

Prescriptions are necessary for patients to obtain certain drugs primarily because some drugs can be habit-forming. The requirement for a prescription helps to regulate the use of medications that have a high potential for abuse, addiction, or adverse effects. These controlled substances include opioids, benzodiazepines, and certain stimulants, which, if misused, can lead to serious health risks or dependencies. By having a prescription model in place, healthcare providers can monitor use and ensure that these medications are being prescribed and taken appropriately, ultimately promoting patient safety and responsible management of treatments.

The other options, while they may touch on aspects of the healthcare system or drugs, do not address the primary reason for the prescription requirement as effectively as the potential for habit-forming effects.