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  1. Methadone: Uses, Dose, Side Effects, Drugs.com

  2. Methadone: Purpose, Uses, Side Effects, and Risks - WebMD

  3. Methadone | SAMHSA

  4. Methadone - Wikipedia

  5. Methadone: MedlinePlus Drug Information

  6. Methadone: 7 things you should know - Drugs.com

  7. Methadone: Side Effects, Dosage, Uses, and More - Healthline

  8. Methadone (Oral Route) Description and Brand Names - Mayo Clinic

  9. Methadone | NAMI