My physician prescribed metaxalone for severe muscle cramps. My doctor knows my medical history over the past 25 years which includes a number of orthopedic issues. Optum denied the RX stating that the doctor had to get prior authorization and after 2 appeals and receipt of the requested information from my doctor, continued to deny the Rx saying that I needed to take other lesser drugs (which I had already taken without relief). I eventually paid for the Rx out of pocket after more than 2 days of terrible pain from muscle spasms. Customer Service for United HealthCare and Optum were both AWFUL!!