An opioid is any synthetic or natural agent that stimulates opioid receptors and produces opium-like effects. These are used in the...

Opioid is a class of drug that includes the illegal drug heroin, synthetic opioids such as fentanyl, and pain relievers available legally...

To the people who can never get around medical terms, an opioid is, in fact, drugs, prescribed or otherwise. They never posed to be a...