Agonist/Antagonist Opioid Analgesics. When a affected person has Earlier obtained or is at this time undergoing a training course of therapy with a pure opioid agonist analgesic like Dilaudid, agonist/antagonist analgesics like pentazocine, nalbuphine, butorphanol, and buprenorphine, should be used with caution.Breastfeeding. Dilaudid tablets or