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  1. Fentanyl - Wikipedia

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

  3. What Is Fentanyl? - WebMD

  4. What is Fentanyl? | Faces of Fentanyl - fof.dea.gov

  5. Fentanyl - DEA.gov

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

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

  8. Facts about Fentanyl - DEA.gov

  9. Fentanyl - StatPearls - NCBI Bookshelf - National Center for ...

  10. Fentanyl: MedlinePlus Drug Information