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| 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 |