Methocarbamol is a medication used to treat muscle spasms and pain. It is classified as a muscle relaxant and works by slowing activity in the nervous system to allow the body to relax. Methocarbamol is usually taken orally as a tablet and is typically taken four times a day at first, then it may be changed to three to six times a day. It is usually used along with rest, physical therapy, and other treatments. Methocarbamol may cause side effects such as headache, dizziness, drowsiness, nausea, vomiting, upset stomach, blurred vision, and lack of coordination. It is important to tell your doctor or pharmacist about any other medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take, as well as any medical conditions you have.