Changing Routes of Administration of Opioids

Equianalgesic Doses of Opioid Analgesics
Oral/Rectal Dose (mg)
Analgesic
Parenteral Dose (mg)
100
Codeine
60
Fentanyl
0.1
15
Hydrocodone
4
Hydromorphone
1.5
2
Levorphanol
1
150
Meperidine
50
10
Methadone
5
15
Morphine
5
10
Oxycodone

An equianalgesic table such as this one (adapted from Levy) can be used:

  1. On the horizontal axis to switch routes of administration
  2. On the vertical axis to switch between opioids.