. 2016 Nov 21;15:95. doi: 10.1186/s12904-016-0169-5

Table 1.

Equianalgesic dose (mg) of different types of opioids [47, 48]

Types of Opioids (Route)	Oral	Parenteral^a
Morphine sulfate	30 mg	10 mg (IV), 15 mg (SC)
Pethidine hydrochloride (IV)	–	100 mg (IV)
Codeine phosphate tablet (Oral)	200 mg	–
Fentanyl citrate (IV)	–	0.1 mg
Methadone and Tramadol	Morphine dose equivalence not being reliably established

^a IV intravenous route, SC subcutaneous route