Muscle relaxants, such as diazepam or cyclobenzaprine, are prescribed to alleviate back pain caused by muscle spasms. These medications work by reducing muscle tension, helping to relieve discomfort and improve mobility. Muscle relaxants are often used in combination with painkillers like paracetamol or NSAIDs for more comprehensive pain management. However, they can cause drowsiness and are generally recommended for short-term use. It’s important to follow your GP’s instructions and not to exceed the prescribed dosage to avoid adverse effects.