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  1. Fentanyl - DEA.gov

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

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

  4. Fentanyl - Wikipedia

  5. Facts about Fentanyl - DEA.gov

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

  7. Fentanyl: The Most Dangerous Illegal Drug in America | RAND

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

  9. Fentanyl: MedlinePlus Drug Information