A study published in J Manipulative Physiol Ther. 2004 Jul-Aug;27(6):388-98. comparing chiropractic adjustments to muscle relaxants for subacute low back pain concluded that chiropractic adjustments resulted in a more profound reduction of subacute low back pain then the use of muscle relaxers.http://www.ncbi.nlm.nih.gov/pubmed/15319761