Hydrocodone 40mg equals 40 MME
According to the CDC 2022 Clinical Practice Guideline, hydrocodone has a conversion factor of 1.0, meaning 40 mg of hydrocodone equals 40 morphine milligram equivalents (MME). 1
Calculation Method
The calculation is straightforward:
- Hydrocodone dose (mg) × Conversion factor (1.0) = MME
- 40 mg × 1.0 = 40 MME
This conversion factor is consistent across both the 2016 and 2022 CDC guidelines 1, 2, and is supported by the NCCN 2025 Cancer Pain Guidelines 3.
Clinical Context
This 40 MME daily dose falls within the moderate-risk range. The CDC guidelines emphasize that:
- Starting doses for opioid-naïve patients should typically be 20-30 MME/day 1
- At ≥50 MME/day, clinicians should pause and carefully reassess individual benefits and risks before any further increases 1
- Your patient at 40 MME/day is approaching this threshold where risk-benefit reassessment becomes critical
Important Caveats
These MME conversions are for calculating total daily opioid exposure—NOT for determining doses when switching between opioids. 1 When rotating from one opioid to another, the new opioid should typically be dosed substantially lower than the calculated MME to avoid overdose due to:
- Incomplete cross-tolerance between opioids
- Individual variability in opioid pharmacokinetics 1
Hydrocodone's equianalgesic data are not well-substantiated. 3 The NCCN guidelines note that while hydrocodone may be approximately equipotent with oral morphine, clinical experience suggests its effective dose varies considerably, and it should be considered a mild, initial-use opioid 3.
The conversion factor of 1.0 represents a consensus estimate rather than high-quality evidence, with significant inter-individual variability reported in clinical practice 4, 5.