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Opioid
Common
8
Codeine
Fentanyl
Heroin
Kratom
Methadone
Morphine
Oxycodone
Tramadol
Other opioids
5
Lean
O-Desmethyltramadol
Tapentadol
Tianeptine
U-47700
Morphinan
7
Buprenorphine
Desomorphine
Dihydrocodeine
Ethylmorphine
Hydrocodone
Hydromorphone
Oxymorphone
Fentanyl analogues
3
Acetylfentanyl
Acrylfentanyl
Furanylfentanyl