Final answer:
A prescription is not required for all medical devices, but medicinal oxygen does require a prescription.
Step-by-step explanation:
A prescription is not required for all medical devices. While some medical devices may require a prescription, others can be purchased over-the-counter without a prescription. It depends on the specific device and its intended use.
As for medicinal oxygen, it does require a prescription. Medicinal oxygen is considered a prescription drug and is regulated by the FDA. It is typically prescribed for medical conditions such as respiratory disorders or in emergency situations.