Blended Agonist/Antagonist and Partial Agonist Opioid Analgesics The concomitant use of opioids with other opioid analgesics, for instance butorphanol, nalbuphine, pentazocine, could lessen the analgesic effect of oxycodone and acetaminophen tablets and/or precipitate withdrawal symptoms. Suggest patient to stay away from concomitant use of these d