What pill is small round dark red has an m in a box with 30 on back

Not Medical Advice: A round purple pill with the imprint 30 on the front, and M on the back of it (about 7mm in diameter) is 30mg of Morphine sulfate SR (made by Mallinckrodt Pharmaceuticals). Morphine sulfate SR is a narcotic analgesic that is used to treat pain. Abuse of this drug may lead to severe psychological or physical dependence. This prescription-only medication may pose a risk to an unborn fetus, and should be used only under a doctor's supervision.

Tags: ms continpill 
Thursday, February 16 2012
Source: http://www.drugs.com/imprints/30-m-8691.html