💊 Opioid Morphine Milligram Equivalents (MME)
Morphine milligram equivalents (MME) standardize different oral opioids onto a single morphine scale for daily-dose risk assessment.
≥50 MME/day signals increased overdose risk and prompts reassessment; ≥90 MME/day warrants avoidance or careful justification with added monitoring (original synthesis · not guideline verbatim).
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When to use
Enter each opioid's total daily oral dose; the tool sums the morphine-equivalent total and flags the CDC 50 and 90 MME/day risk thresholds.
How it works
Daily MME = Σ (drug daily dose × conversion factor). Factors: morphine 1, oxycodone 1.5, hydrocodone 1, hydromorphone 4, oxymorphone 3, codeine 0.15, tramadol 0.1, tapentadol 0.4.
Key points
- ≥50 MME/day signals increased overdose risk and prompts reassessment; ≥90 MME/day warrants avoidance or careful justification with added monitoring (original synthesis · not guideline verbatim).
- MME is a risk-assessment metric, not an opioid-rotation tool—when rotating, reduce the calculated equivalent by 25–50% for incomplete cross-tolerance.
- Methadone (nonlinear), buprenorphine (partial agonist), and transdermal fentanyl are excluded and require dedicated conversion methods.
References
- Dowell D, et al. CDC Clinical Practice Guideline for Prescribing Opioids — United States, 2022. MMWR Recomm Rep.
- CDC. Calculating Total Daily Dose of Opioids for Safer Dosage.
Frequently asked questions
- What is Opioid Morphine Milligram Equivalents (MME)?
- Morphine milligram equivalents (MME) standardize different oral opioids onto a single morphine scale for daily-dose risk assessment.
- How is Opioid Morphine Milligram Equivalents (MME) calculated? What is the core formula?
- Daily MME = Σ (drug daily dose × conversion factor). Factors: morphine 1, oxycodone 1.5, hydrocodone 1, hydromorphone 4, oxymorphone 3, codeine 0.15, tramadol 0.1, tapentadol 0.4.
- When is Opioid Morphine Milligram Equivalents (MME) used?
- Enter each opioid's total daily oral dose; the tool sums the morphine-equivalent total and flags the CDC 50 and 90 MME/day risk thresholds.
- What are the key clinical points for Opioid Morphine Milligram Equivalents (MME)?
- ≥50 MME/day signals increased overdose risk and prompts reassessment; ≥90 MME/day warrants avoidance or careful justification with added monitoring (original synthesis · not guideline verbatim). MME is a risk-assessment metric, not an opioid-rotation tool—when rotating, reduce the calculated equivalent by 25–50% for incomplete cross-tolerance. Methadone (nonlinear), buprenorphine (partial agonist), and transdermal fentanyl are excluded and require dedicated conversion methods.
- What are the limits and cautions when using Opioid Morphine Milligram Equivalents (MME)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.