<prompt> Not true about NaltrexoneParenterally administeredUsed to prevent relapse of heavy drinkingLong actingCause hepatotoxicity  <response>: Ans. is a i.e., Parenterally administered Naltrexone antagonist on all opioid receptors o More potent than naloxone. It can be given orally It is used as a maintenance drug for opioid addicts - opioid blockade therapy ofpostaddict. o It is also used to decrease craving in chronic alcoholism. o The most impoant side effect is hepatotoxicity. 