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  1. Fentanyl Side Effects: Common, Severe, Long Term - Drugs.com

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

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

  4. Fentanyl: Uses, Warnings & Side Effects - Cleveland Clinic

  5. Fentanyl Short- and Long-Term Side EffectsDrugAbuse.com

  6. What Is Fentanyl? - WebMD

  7. Side effects of fentanyl - NHS

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

  9. Fentanyl: MedlinePlus Drug Information

  10. Fentanyl Transdermal: Uses, Side Effects, Interactions ...