Overview
- Researchers used Drug Checking Los Angeles purity tests from more than 500 fentanyl samples and surveys of 47 regular users to model daily intake in morphine milligram equivalents, or MME, a standard that compares opioid potency.
- The study estimates an average daily exposure of about 8,887 MME for regular users in Los Angeles, which the authors say is far larger than clinical fentanyl dosing and would equal hundreds of hospital fentanyl vials or hundreds of opioid pills.
- Those exposures likely produce very high opioid tolerance, which clinicians report makes it harder to start patients on methadone or buprenorphine and to manage withdrawal during treatment initiation.
- Authors note key limits to generalizing the exact number because the data come from a voluntary Los Angeles program, the city saw a later rise of illicit fentanyl than other regions, and few cities collect comparable consumer-level purity data.
- Because fentanyl is synthetic and far more potent per milligram than heroin, the study argues clinicians and public health programs should expand withdrawal management, tailor MOUD strategies to real-world exposures, and scale drug-checking surveillance to guide care.