Ans. is 'b' i.e., Craving for opioids o Naltrexone can reverse all effects of opioids like sedation, analgesia, constipation, respiratory depression and miosis, but it does not reduce craving. "Craving for opioids may continue during naltrexone treatment" Principles of addiction medicine o It is interesting to know that naltrexone does not reduce craving for opioid, but it reduces craving for alcohol in chronic alcoholism