opioid(redirected from Opiod)
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1. any synthetic narcotic that has opiate-like activities but is not derived from opium.
Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics.
Any of various compounds that bind to specific receptors in the central nervous system and have analgesic and narcotic effects, including naturally occurring substances such as morphine; synthetic and semisynthetic drugs such as methadone and oxycodone; and certain peptides produced by the body, such as endorphins. Also called opiate.
opioidadjective Referring to opium-like activity, especially on receptors.
(1) A drug that has narcotic effects similar to opium (Papaver somniferum) but is not derived from it.
(2) An endogenous peptide (e.g., endorphin) that acts on opioid receptors.
opioidNeurology A pain-attenuating peptide that occurs naturally in the brain, which induces analgesia by mimicking endogenous opioids at opioid receptors in the brain. See Opioid-mediated analgesia system.
Agonists The most potent opioid agonists are morphine, meperidine, methadone; other opioids include hydromorphine–Dilaudid®, codeine, oxycodone–Percodan®, propoxyphene–Darvon®
Mixed agonsts-antagonists Pentazocine–Talwin®
A narcotic substance, either natural or synthetic.
Any morphine-like synthetic narcotic that produces the same effects as drugs derived from the opium poppy (opiates), such as pain relief, sedation, constipation and respiratory depression.
Mentioned in: Anesthesia, General
Originally, synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics.