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. 2022 Mar 18;13(3):212–229. doi: 10.5312/wjo.v13.i3.212

Table 1.

Strength of opioids

Weak opioids
Strong opioids
Codeine Morphine
Dihydrocodeine Methadone
Tramadol Fentanyl
Oxycodone
Tapentadol
Oxymorphone