Not medical advice: A pink capsule-shaped pill with the imprint M on one side and the imprint 5859 on the other has been identified as Metaxalone 800 mg. It is in the skeletal muscle relaxants drug class and is prescribed to treat fibromyalgia and muscle spasm. Skelaxin is the brand name for Metaxalone.
Less serious side effects: diarrhea, drowsiness, irritability, stomach cramps, and vomiting. Stop taking Metaxalone and contact your doctor right away if you experience difficulty in breathing or swallowing, dark urine, fast heartbeat, black, tarry stools, or unusual bruising or bleeding.
Of interest, a new study shows that electromagnetic therapy may offer pain relief to fibromyalgia patients as well as help improve their depression symptoms and mood. Find out more from CBS New York.