antagonists

muscles having opposite effects; the contraction of one neutralizes the contraction of the other.

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Antagonists

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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