A first-of-its-kind fentanyl vaccine has cleared its earliest human test, raising the prospect of a shot that stops the deadliest drug in America from ever reaching the brain.
ARMR Sciences, the biotech developing the vaccine, said on Wednesday 17 June 2026 that the experimental shot showed promise in an early-stage clinical trial, as reported by NBC News. The treatment is the first fentanyl vaccine ever tested in people.