CAMBRIDGE, Mass. (AP) — The Food and Drug Administration is attaching a black box warning to the Vertex Pharmaceuticals hepatitis C treatment Incivek over a potentially fatal rash.

The FDA says patients taking the pill in combination with two other treatments should stop immediately if they develop a rash that grows worse or comes with symptoms like a fever, diarrhea or mouth sores.

Recommended Stories

Anti-abortion activists have a Plan B if Supreme Court rejects mifepristone restrictions

Consumer watchdog asks FDA to revisit compounders

FDA panel wants limits on hydrocodone painkillers