Assertion: opioid analgesic | /r/HasProperty | classified by chemical structure
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text: Opioid analgesics can be classified by chemical structure (phenanthrenes, phenylpiperidines, or diphenylheptanes) and by the degree of agonist action at the receptor site (see Table 2).6,9,10 Fentanyl, hydromorphone, levorphanol, meperidine, morphine, oxycodone, and oxymorphone are considered strong full agonists or strong opioids.