and muscle relaxants are used to treat the severe pain and discomfort that is caused by back pain and muscle spasms. A muscle spasm is when that one or more of your muscles contract and the twitching or twitching is not under your control. It may occur due to a variety of reasons, and it can be extremely painful. The medications prescribed for relaxation can differ in their composition, chemical structure, and how they function in the brain. Each comes with its own dangers and advantages.