Which of the following is an example of prescription drug abuse?

Taking a medication that is prescribed to someone else is a clear example of prescription drug abuse because it involves using a pharmaceutical product without a valid prescription for that specific individual. Medications are prescribed based on a patient’s unique health needs, medical history, and conditions. When someone takes a prescription drug that was not intended for them, it can lead to dangerous side effects, improper treatment, and potential addiction. This practice not only undermines the medical guidelines surrounding drug use but also poses serious risks to both physical and mental health, making it an unsafe and unethical choice.

The other choices highlight responsible or neutral behaviors regarding medication use, such as taking vitamins for health benefits, using medications exactly as prescribed, or avoiding medications altogether, none of which constitute abuse.