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antagonists
| n. | 1. | muscles having opposite effects; the contraction of one neutralizes the contraction of the other. |
EncyclopediaSeeantagonistAntagonists
opioid Neurology 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. Opioids Agonists The most potent opioid agonists are morphine, meperidine, methadone; other opioids include hydromorphine–Dilaudid®, codeine, oxycodone–Percodan®, propoxyphene–Darvon® Antagonists Naloxone–Narcan® Mixed agonsts-antagonists Pentazocine–Talwin®
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