INFO - Relative potency of commonly used opioids

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Table 4 Relative potency of commonly used opioids

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Analgesic | Potency ratio | Duration of action

with oral morphine (hours)

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Codeine 1/10 3-5

Pethidine 1/8 2-3

Tramadol 1/5 5-6

Dipipanone 1/2 3-5

Oxycodone 1.5-2 5-6

Dextromoramide 2 2-3

Phenazocine 5 6-8

Methadone 5-10 8-12

Hydromorphone 7.5 3-5

Buprenorphine 60 6-8

Fentanyl 150 72

http://pmj.bmjjournals.com/cgi/content/full/77/908/371/T4

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