Fentanyl has become one of the deadliest drugs in the United States, with fentanyl and related synthetic opioid variants now claiming more lives each year than car crashes and gun violence combined. When taken in excessive amounts, these drugs disrupt critical brain functions and can stop the signals that control breathing. Although existing treatments can reverse an overdose, they must be administered quickly to be effective.

Researchers at Scripps Research are exploring a very different strategy. Instead of treating an overdose after it happens, they have developed an experimental vaccine designed to train the immune system to neutralize fentanyl before the drug can reach the brain. Their findings, published in the Journal of Medicinal Chemistry, suggest the vaccine may protect not only against fentanyl itself but also against many fentanyl-related “designer drugs” that are modified to increase potency or avoid detection.

“What this research shows us is that we don’t have to keep playing catch-up with every new synthetic designer drug that emerges,” says senior author Kim Janda, the Ely R. Callaway, Jr. Professor of Chemistry at Scripps Research. “By training the immune system to recognize the entire fentanyl class—not just individual structures—we can stay ahead of illicit drug traffickers.”