Opioid Dose Conversion and Risk Assessment

Calculation Guidelines

The Centers for Disease Control and Prevention (CDC) recommends calculating the total morphine milligram equivalent (MME) for opioid medications, with a total MME of 219 for morphine IR 90mg oral, oxycodone 60mg oral, and hydromorphone (Dilaudid) 2.25mg IV 1, 2, 3
The conversion factor for oral morphine is 1.0, resulting in 90 MME for a 90mg dose 1, 3
The conversion factor for oral oxycodone is 1.5, resulting in 90 MME for a 60mg dose 1, 3
The conversion factor for hydromorphone is 5.0, with an additional potency consideration for IV administration, resulting in 22.5 MME for a 2.25mg IV dose 1, 3, 4

The route of administration affects opioid potency, with IV opioids being 2-3 times more potent than oral equivalents due to first-pass metabolism avoidance 4
The CDC recommends careful monitoring for respiratory depression and other adverse effects when the total MME exceeds 90 MME/day 1, 3
Individual patient factors, such as pharmacokinetics and tolerance, can affect the clinical response to opioid medications 2, 3
Hydromorphone is a potent opioid with significant risk for respiratory depression, particularly when administered intravenously 3
MME calculations should be used as a guideline for risk assessment rather than for direct opioid rotation, which typically requires dose reduction due to incomplete cross-tolerance 1, 2