Treatment Standards in the U.S. Diazepam is frequently prescribed to treat muscle spasms caused by conditions like multiple sclerosis or spinal cord injuries. In the U.S., the drug is often used as part of a broader treatment plan that may include physical therapy and other medications. Its muscle relaxant properties provide symptomatic relief but carry the risk of drowsiness and coordination issues, which can impact daily activities. The FDA warns against driving or operating machinery while using diazepam.