Fentanyl is a synthetic opioid that’s 50-100 times stronger than the pain reliever morphine. While some people use fentanyl on purpose, many others get it in their systems without their knowledge.

Medically reviewed by Kelly Wood, MD You may have higher than normal ketone levels during exercise, fasting, or sleep. High ketone levels can be dangerous, especially if you have diabetes.You can test ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Fentanyl overdose deaths in Los Angeles ...