the analgesic effect of opioids is due to their
Opioid Opioids are substances that act on opioid receptors to produce morphine-like effects.[2] Medically they are primarily used for pain relief, including anesthesia.[3] Other medical uses include suppression of diarrhea, treating opioid use disorder, reversing opioid overdose, suppressing cough, and suppressing opioid induced constipation.[3] Extremely potent opioids such as carfentanil are only approved for veterinary use.[4] Opioids are also frequently used non-medically for their euphoric effects or to prevent withdrawal.[5]