Abstract Background Methadone. a long-acting opioid agonist maintenance treatment (MMT) is used to treat opioid addiction by preventing opioid withdrawal and reducing cravings. However. it is important to note that mental conditions may persist. https://www.roneverhart.com/MagnaFlow-2009-2011-Buick-Lucerne-OEM-Grade-Federal-EPA-Compliant-Direct-Fit-Catalytic-Converter/