Naltrexone is an opioid antagonist that was initially used to treat opioid and alcohol addiction. Low dose naltrexone (LDN — usually < 5 mg/day) has become popular as an off-label treatment for many autoimmune disorders throughout the past two decades. What is LDN? Low Dose Naltrexone is a strong antagonist of opioid receptors. LDN is […] … learn more→