OPIOID AGONIST By N., Sam M.S. - April 7, 2013 any drug with improving impacts at opioid receptors in the CNS. Commonly referred to as narcotic agonist. OPIOID AGONIST: "Janelle is allergic to all opioid agonists." Related Psychology Terms OPIOID ANTAGONIST OPIOID DEPENDENCE OPIOID ANALGESIC NARCANNALTREXONE NALOXONE ANALGESICS AGONIST-ANTAGONIST OPIOIDS BUTORPHANOL BUPRENORPHINE Cite this page: N., Sam M.S., "OPIOID AGONIST," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/opioid-agonist/ (accessed October 22, 2021).