Using methadone for pain is different from using methadone for addiction.
It’s illegal in the United States for a doctor to prescribe methadone for the purposes of treating addiction, unless she is working at an appropriately licensed Opioid Treatment Center. Some doctors don’t know this, and have had grumpy DEA agents pay them a visit. However, it is legal for a doctor to prescribe methadone for pain, as long as she has an appropriate DEA license.
Methadone is prescribed differently when treating pain than when treating addiction. This is because each dose of methadone has an analgesic (anti-pain) effect of about six hours. However, methadone’s opioid blocking effect lasts for twenty-four hours or more. This is why methadone for pain should be dosed multiple times per day, but methadone for addiction can be given once per day.
The dose of methadone often varies, too, depending on the disease being treated…
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