We hope to identify the effects of adjunctive 5% lidocaine patches in the treatment of acute non-radicular low back pain in patients discharged from the emergency department.

We hypothesize that in patients with acute non-radicular low back pain (LBP), treatment with adjunctive lidocaine 5% transdermal patches will lead to improved pain at one week compared with standard therapy alone.

Using a prospective randomized controlled study design, we will compare the addition of lidocaine 5% patches to standard therapy vs standard therapy alone in the relief of pain for patients discharged from the emergency department (ED) with acute non-radicular LBP.