<prompt> All are used in heroin poisoning EXCEPTClonidineBuprenorphinePentazocineHaloperidol  <response>: Ans. is d i.e Haloperidol Niraj Ahuja gives a list of the following drug used in opium toxicity -Naloxone, NaltrexoneMethadoneClonidineLAAM levo-alpha-acetyl methadolPropoxypheneD PhenoxylateBuprenorphineLofexidineThis leaves us with haloperidel Pentazocine.I could not find which of them is used but my reason and intuition says to go with pentazocine.Pentazocine must have some use in heroin poisoning. Pentazocine is an opioid and if methadone, another opioid, can be used, so can pentazocine. 