A new wave of concern has spread across the United States over multi-colored "rainbow fentanyl" pills, powders and blocks -- that look similar to candy or sidewalk chalk -- being sold and used in ...

Fentanyl overdoses can happen in minutes, and the usual tools respond after the damage is already underway. A proposed vaccine tries a different approach: keep fentanyl tied up in the bloodstream so ...

Researchers are closing in on a new kind of protection against the deadliest drug in the United States: a vaccine that trains the immune system to trap fentanyl before it reaches the brain. If early ...

A young man approached a card table set up under the Green Line tracks on the city’s West Side and asked the woman behind it if she had any clean needles or naloxone, a medication that can reverse the ...