 This is an open-label, single-group, multi-centre trial to confirm the safety and efficacy of loxoprofen sodiummethocarbamol IP-TN when administered orally for 2 weeks to patients with low back pain, scapulohumeral periarthritis, or cervico-omo-brachial syndrome associated with muscle strain. More than 90 patients will be screened to enroll approximately 80 patients in the trial. 