<prompt> Naltrexone is used in opioid dependence to -Prevent respiratory depressionTreat withdrawal symptomsPrevent relapseTreatment of opioid overdose  <response>: Naltrexone is a pure opioid antagonist. It is competitive antagonist at all opioid receptors. It can be used orally, to assist in the rehabilitation of ex-opioid abusers who are fully withdrawn otherwise it will induce an acute withdrawal syndrome. A patient who then takes an opioid, fails to experience the kick or euphoria because of the opioid antagonistic actions of the Naltrexone. 