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  1. What is fentanyl? Uses, misuse, and side effects - Medical News Today

  2. Fentanyl: Uses, Dosage, Side Effects & Warnings - Drugs.com

  3. Fentanyl - Wikipedia

  4. Fentanyl - DEA.gov

  5. What is fentanyl and why is it behind the deadly surge in US drug ...

  6. What Is Fentanyl? - WebMD

  7. Phentermine - Wikipedia

  8. What Is Fentanyl and Why Is It So Dangerous? - WSJ

  9. Fentanyl: What is it, what are its effects, how is it consumed and …

  10. What makes fentanyl so dangerous and how can people prevent ... - CNN