Robaxin tablets contain 500mg of methocarbamol as the active ingredient. They are primarily used to relieve muscle spasms and associated pain. Robaxin is most effective when used in conjunction with physical therapy and other comprehensive treatment plans. It acts by helping to relax the muscles, thereby alleviating discomfort. In addition to Robaxin, these tablets are also marketed under the names Robinax and Mecotha.