I. Morphine and its analogues II. Meperidine analogues III. Methadone analogues IV. Morphinan analogues V. Morphan analogues or benzazocin derivatives
CLASSIFICATION a. Tramadol b. Tilidine c. Sufentanil d. NexeridineI. Morphine and its analogues

a. Hydromorphone derivatives

b. Dihydromorphine derivatives

II. Meperidine analogues

III. Methadone analogues


IV. Morphinan analogues

V. Morphan analogues or benzazocin derivatives

VI. Miscellaneous



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