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Low dose naltrexone (LDN), where the drug is used in doses approximately one-tenth those used for drug/alcohol rehabilitation purposes, is being used by some as an "off-label" experimental treatment for certain immunologically-related disorders, including HIV/AIDS, multiple sclerosis Parkinson's, cancer, autoimmune diseases such as rheumatoid arthritis or ankylosing spondylitis, and central nervous system disorders.
Just keep in mind that it will block the effects of opoids.