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Methadone: Uses, Dose, Side Effects, Drugs.com
Methadone: Purpose, Uses, Side Effects, and Risks - WebMD
Methadone | SAMHSA
Methadone - Wikipedia
Methadone: MedlinePlus Drug Information
Methadone: 7 things you should know - Drugs.com
Methadone: Side Effects, Dosage, Uses, and More - Healthline
Methadone (Oral Route) Description and Brand Names - Mayo Clinic
Methadone | NAMI