Compounds with activity like OPIATE ALKALOIDS, acting at OPIOID RECEPTORS. Properties include induction of ANALGESIA or NARCOSIS.

Synonyms: Analgesics, Opioid, Partial Agonists, Opioid, Analgesic, Opioid, Opioid Mixed Agonist-Antagonists, Agonist-Antagonists, Opioid Mixed, Agonists, Opioid Partial, Opioid, Full Agonists, Opioid, Full Opioid Agonists, Opioid Agonists, Partial, 0, Opioid Mixed Agonist Antagonists, Agonists, Partial Opioid, Agonists, Opioid Full, Agonists, Full Opioid, Opioids, Opioid Analgesic, Opioid Agonists, Full, Opioid Partial Agonists, Partial Opioid Agonists, Opioid Analgesics, Opioid Full Agonists, Mixed Agonist-Antagonists, Opioid