Anopioid modulator (oropioid receptor modulator) is a drug which has mixed agonist and antagonist actions at different opioid receptors and thus cannot clearly be described as either an opioid agonistorantagonist. An example of an opioid modulator is buprenorphine, which is a partial agonist of the μ-opioid receptor and an antagonist of the κ-opioid receptor.[1]
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