Table 1 : Equipotent intravenous dosages of common opioids. To convert mg to mcg, multiply by 1000 (0.02 mg = 20 mcg).


Drug IV Dose (mg)

Morphine 2
Hydromorphone 0.3
Fentanyl 0.02
Meperidine 15
Methadone 0.4
Buprenorphine 0.1
Butorphanol 0.4
Nalbuphine 2

A. Quraishi et al.Journal of Anesthesiology and Clinical Science  2013 2:1DOI : 10.7243/2049-9752-2-1