Experimental fentanyl vaccine stops the drug from entering the brainEven when someone is determined to beat their fentanyl addiction, there's still a good chance they will relapse at some point, and start taking the opioid again.In tests performed on rats, the vaccine was shown to be effective at keeping fentanyl from reaching the brain, while not producing any significant side effects.And importantly, the antibodies which it produces specifically target the fentanyl and hapten molecules, leaving all others alone."Our vaccine is able to generate anti-fentanyl antibodies that bind to the consumed fentanyl and prevent it from entering the brain […] Thus, the individual will not feel the euphoric effects and can 'get back on the wagon' to sobriety."A paper on the research – which also involved scientists from Tulane University, the Baylor College of Medicine, and the Veteran’s Affairs Medical Center in Houston – was recently published in the journal Pharmaceutics."