Agonist/Antagonist Opioid Analgesics. When a client has Formerly acquired or is presently undergoing a study course of therapy with a pure opioid agonist analgesic like Dilaudid, agonist/antagonist analgesics like pentazocine, nalbuphine, butorphanol, and buprenorphine, ought to be used with warning.Picked from information involved with permissio