So let's look at nine popular muscle relaxants, including how well they work and their side effects. Methocarbamol. Methocarbamol (Robaxin) is a well-studied medication that treats back pain. ... Cyclobenzaprine. ... Carisoprodol. ... Metaxalone. ... Tizanidine. ... Baclofen. ... Oxazepam and diazepam. ... Chlorzoxazone. More items... Apr 26, 2023