Combined Agonist/Antagonist and Partial Agonist Opioid Analgesics The concomitant usage of opioids with other opioid analgesics, for instance butorphanol, nalbuphine, pentazocine, may possibly lessen the analgesic effect of oxycodone and acetaminophen tablets and/or precipitate withdrawal symptoms. Suggest patient to prevent concomitant use of such