Story perspectives

Patent-Free Fentanyl Vaccine Prevents Overdose in Mice and Analogs

7/13/2026

Summary

Story summary

Kim D. Janda, a U.S. chemist, unveiled a patent-free vaccine against fentanyl and analogs.
Vaccinated mice required 1,400-1,800 µg/kg fentanyl to depress breathing, versus ~150 µg/kg for controls.
In vaccinated mice, brain fentanyl fell to 17.2 nM while blood rose to 1,719 nM.
The hapten swaps fentanyl’s piperidine ring, yielding antibodies that bind fentanyl and analogs but not morphine, methadone, or oxycodone, and Janda notes $800 could buy ~650,000 opioid doses, planning human trials.

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Story summary

Kim D. Janda, a U.S. chemist, unveiled a patent-free vaccine against fentanyl and analogs.
Vaccinated mice required 1,400-1,800 µg/kg fentanyl to depress breathing, versus ~150 µg/kg for controls.
In vaccinated mice, brain fentanyl fell to 17.2 nM while blood rose to 1,719 nM.
The hapten swaps fentanyl’s piperidine ring, yielding antibodies that bind fentanyl and analogs but not morphine, methadone, or oxycodone, and Janda notes $800 could buy ~650,000 opioid doses, planning human trials.