Blended Agonist/Antagonist and Partial Agonist Opioid Analgesics The concomitant use of opioids with other opioid analgesics, including butorphanol, nalbuphine, pentazocine, may lessen the analgesic effect of oxycodone and acetaminophen tablets and/or precipitate withdrawal symptoms. Advise patient to stay away from concomitant use of such drugs.Pa