antagonists


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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® 

antagonists,

n muscles that counterbalance agonists during specific movements.
References in classic literature ?
So heavy was the stroke that the striker half overbalanced himself, a circumstance of which his antagonist took a prompt advantage.
One of them flared down and vanished far away in the north; two dropped with something twisted and crippled in their movements; then a group of antagonists came down from the zenith in an eddying conflict, two Asiatics against one German, and were presently joined by another, and drove away eastward all together with others dropping out of the German line to join them.
The antagonists stood forty paces apart at the farther edge of the clearing.
They show up the faults of one's cause so much more plainly than one's antagonists.
With his free hand he wiped the gore from his eyes, and with the fighting smile of his father touching his lips, leaped upon his antagonists with renewed fury.
As I ran forward toward Perry I fired four more shots, dropping three of our antagonists.
Here was the appearance and the scent of a man-thing and Numa had tasted of human flesh and learned that though not the most palatable it was certainly by far the easiest to secure, yet there was that in the bestial growls of the strange creature which reminded him of formidable antagonists and gave him pause, while his hunger and the odor of the hot flesh of Bara goaded him almost to madness.
He spoke in English, which, of course, Numa did not understand at all, but there must have been something reassuring in the tone, for Numa whined pleadingly and moved impatiently to and fro parallel with their antagonists.
But as the battle continued he realized that there might be a limit to the number of antagonists which he could successfully withstand, since he could scarcely hope with but two hands to reach the throats of three enemies, or ward off the blows and clutches of six powerful hands, or the gnashing of three sets of savage fangs.
The shield, long and oval, is utilized more as back-armor than as a defense against frontal attack, for the close-set armlets of gold upon the left forearm are principally depended upon to ward off knife, spear, hatchet, or arrow from in front; but against the greater carnivora and the attacks of several human antagonists, the shield is utilized to its best advantage and carried by loops upon the left arm.
In the first place, he is thought just, and therefore bears rule in the city; he can marry whom he will, and give in marriage to whom he will; also he can trade and deal where he likes, and always to his own advantage, because he has no misgivings about injustice and at every contest, whether in public or private, he gets the better of his antagonists, and gains at their expense, and is rich, and out of his gains he can benefit his friends, and harm his enemies; moreover, he can offer sacrifices, and dedicate gifts to the gods abundantly and magnificently, and can honour the gods or any man whom he wants to honour in a far better style than the just, and therefore he is likely to be dearer than they are to the gods.
Jones now finding himself engaged with two, thought it necessary to rid himself of one of his antagonists as soon as possible.