I heard my little brother talking about pills called "M boxes," I found one and it was white with a "M" inside of a square on one side, I can't remember if it had any numbers on the other side or not. I can't find it on the pill identifier. Does anyone know what it is?
M in a box is the logo used by Mallinckrodt Pharmaceuticals. It is used on some, but not all of their products.
It is however, used on the Mallinckrodt Methylin, oxycodone, methadone, meperidine, morphine and other painkillers so that may narrow it down.
You can find images for all the Mallinckrodt pills at https://www.drugs.com/imprints.php?action=search&ndc=00406
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