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...the body's μ-opioid endorphin system, delivering pain relief via the same receptor mechanism as morphine.{{citation needed|date=September 2015}} ...uggest it functions to produce withdrawal symptoms by competing for opiate receptor sites within the CNS (a competitive antagonist, not a direct agonist), ther

...INR should be monitored closely. They may also interact with the [[GABA A receptor]] and cause neurological symptoms; this effect is augmented by certain [[no ...for this interaction is believed to be due to a [[synergistic]] increased antagonism of GABA neurotransmission.<ref name="pmid11172695"/>

...oscyamine]], and [[scopolamine]] antagonize the [[muscarinic acetylcholine receptor|muscarinic acetylcholine]] receptors in the eye. By blocking these receptor ...e]], [[dextromethorphan|DXM]], and [[phencyclidine|PCP]] do so as well via antagonism of the [[NMDAR|NMDA]] glutamate receptors. There have also been reports tha

...e Y, Shimizu S, Ohno Y |title=Therapeutic potential of alpha2 adrenoceptor antagonism for antipsychotic-induced extrapyramidal motor disorders |journal=Neuroscie

...tive cannabinoid CB1 receptor agonist: effects on open-field behaviors and antagonism by SR-141716 in rats. ''Behavioural Pharmacology''. 2004 Nov;15(7):517-21.