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  1. Fentanyl - Wikipedia

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

  3. Fentanyl - DEA.gov

  4. Fentanyl Facts | Stop Overdose | CDC - Centers for Disease …

  5. What Is Fentanyl? - WebMD

  6. Fentanyl | National Institute on Drug Abuse (NIDA)

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

  8. Facts about Fentanyl - DEA.gov

  9. Fentanyl | Overdose Prevention | CDC