The legal use of opioids is limited to scenarios where they are prescribed by a licensed medical professional. Given your responses, the correct option for the legal use of opioids is:
- Taking prescription opiates prescribed by a doctor to help manage pain.
Using opioids such as fentanyl and heroin, especially when obtained illegally or without a prescription, is not considered legal or safe. Additionally, taking prescription medication that was prescribed to someone else is also illegal and can pose serious health risks.