LDN - Low-Dose Naltrexone

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Naltrexone is a prescription drug that, at a normal dose of 50 to 100 milligrams (mg), blocks the effects of opioids, a class of drugs often taken for pain relief.  Opioids include illegal drugs like heroin, as well as synthetic pain relief drugs like Vicodin (hydrocodone-acetaminophen).

At very low doses, however, some researchers believe that naltrexone may be able to help people with fibromyalgia, a long-term condition that can cause widespread pain, as well as chronic fatigue syndrome, a condition that causes exhaustion and general discomfort.