Agonist/Antagonist Opioid Analgesics. When a patient has Beforehand obtained or is at the moment undergoing a study course of therapy with a pure opioid agonist analgesic like Dilaudid, agonist/antagonist analgesics like pentazocine, nalbuphine, butorphanol, and buprenorphine, must be used with warning.Since hydromorphone is used for pain, You ar