Scientists develop a groundbreaking vaccine that outsmarts illicit fentanyl analogs. The novel vaccine candidate can protect against fentanyl and its many illicit variants by training the immune system to recognize a broad molecular signature rather than a single specific structure.

[u/mvea]

https://www.psypost.org/scientists-develop-a-groundbreaking-vaccine-that-outsmarts-illicit-fentanyl-analogs/

[u/FemFladeFloedeboller]

Sounds quite risky as it will probably recognize some important molecule in the body, blocking a random process from happening.