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  1. Fentanyl Side Effects: Mental & Physical Effects of Fentanyl Use

  2. Fentanyl - DEA.gov

  3. Fentanyl - Wikipedia

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

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

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

  7. Fentanyl | Overdose Prevention | CDC

  8. U.S. sees a sudden and unexpected drop in fatal overdoses - NPR

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

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