Round white pill with 31 on one side and D on the other side

Not Medical Advice: A white round pill with the imprint 31 on one side and D on the other side is carisoprodol.

The prescription-only drug is a muscle relaxer used to treat muscle spasm, and sold under the brand names SOMA and Vanadom.

Less serious side effects include: drowsiness, dizziness, tremor, headache, depression, feeling irritable, blurred vision, sleep problems (insomnia), nausea, vomiting, hiccups, and upset stomach.

Discontinue the use of carisoprodol if you experience paralysis, extreme weakness or lack of coordination, light-headedness, fainting, fast heartbeat, seizure, vision loss, confusion, or agitation and notify your doctor.

Carisoprodol is a pregnancy category C drug and should only be used during pregnancy when benefit outweighs risk.

WebMD suggests 12 ways to improve back pain.

In the news, Skye McCole Bartusiak, the actress who played Mel Gibson's daughter in The Patriot, recently died of an accidental overdose. The combined effects of hydrocodone, difluoroethane, and carisoprodol are blamed as the cause of death. Find out more from People.

Updated on Wednesday, October 15 2014 at 12:20AM EDT
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