Evaluation of the effect of local therapy with Kapsikam on the dynamics of clinical symptoms and indices of the disability scale, as well as on reducing the doses of systemic non-steroidal anti-inflammatory drugs (NSAIDs) used in patients with acute back pain (LOCUS study).An observational study included 120 patients with nonspecific pain in the lower back and a verified diagnosis of Lumbodynia M54.5; «Lumbodynia with sciatica» M54.4, of which 78 received in addition to the basic treatment with systemic NSAIDs topical drug Kapsikam and 42 - only basic treatment.Results and conclusion. The addition of Kapsikam ointment to systemic NSAIDs accelerated the onset of the analgesic effect, which made it possible to discontinue NSAIDs in 50% of patients after 5 days of use. Local therapy was accompanied by easily tolerated adverse events that did not affect the use of the drug. 97.4% of patients used the study drug as prescribed until the end of the study.