Relative Potency of Narcotic analgesics

Opioid	Approximate Equianalgesic Dose (to 10 mg IV Morphine)	Relative Potency (vs. Morphine)
Morphine	10 mg IV / 30 mg PO	1
Hydromorphone	1.5 mg IV / 7.5 mg PO	6.7 (IV) / 4 (PO)
Fentanyl	0.1 mg IV	100
Oxycodone	15–20 mg PO	1.5–2
Hydrocodone	30–45 mg PO	0.7–1
Oxymorphone	1 mg IV / 10 mg PO	10 (IV) / 3 (PO)
Codeine	200 mg PO	0.15
Meperidine	75–100 mg IV	0.1–0.15
Tramadol	100 mg PO	0.1
Tapentadol	75–100 mg PO	0.2
Buprenorphine	0.3 mg IV / 0.4 mg SL	30–40
Methadone	Highly variable; consult specialist	4–10 (variable)
Levorphanol	2 mg PO	6–8
Sufentanil	0.01 mg IV	1000