FACT: Morphine Milligram Equivalent (MME) limits were never based on science. They were created as rough conversion estimates to help doctors rotate between opioids, not as tools to set laws, caps, or risk thresholds.

Over time, policymakers turned MME into a weapon, used to deny prescriptions, punish providers, and flag stable patients as “high risk.”  There’s no standardized formula, and MME has never been validated as a measure of safety or overdose risk.

What MME Was Meant to Do

MME was designed for opioid rotation, not surveillance or regulation.
It compares approximate potency across opioids, for example:

• 10 mg hydrocodone ≈ 10 MME
• 10 mg oxycodone ≈ 15 MME
• 10 mg methadone ≈ 30–120 MME (depending on formula)

There’s no single equation, and these estimates were never meant to predict risk or guide policy.

What the Science Shows

• No standard formula: CDC, CMS, PDMPs, and state agencies all calculate MME differently, often by 30% or more.
  
• The 90 MME limit is arbitrary: It came from a 2007 Washington State guideline based on opinion, not data.
  
• FDA rejected a 100 MME cap: In 2013, FDA stated, “The scientific literature does not support establishing a maximum recommended daily dose.”
• Even NIH warns against using MME in care: The 2024 HEAL Initiative declared its new calculator is “for research only.”
• Result: Millions of pain patients have been forcibly tapered, denied care, or criminalized because of an unscientific metric.
  

Why It Matters

MME was meant to help clinicians safely convert between medications—not to dictate who deserves pain relief. Until arbitrary MME limits are removed from law, insurance, and PDMP systems, patients will continue to be harmed by policy disguised as science.

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