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The Efficacy of I-ALP Analgesic Gel in Acute and Subacute Musculoskeletal Pain: A Randomized Double-Blind Controlled Trial

Pipat Chumkasian¹, Pongtorn Kietdumrongwong², Thitima Wiriya², Warut Chaiwong², Sirintip Jirarattanasopa³, Sucheela Jitsarojito¹

Affiliation : ¹ Rehabilitation Center, Bangkok Hospital Headquarters, Bangkok, Thailand; ² BDMS Health Research Center, Bangkok Dusit Medical Services PCL, Bangkok, Thailand; ³ Pharmacy Division, Bangkok Hospital Headquarters, Bangkok, Thailand

Objective: To study the efficacy of Immortelle extracts, Arnica, Longan seed, Plai (I-ALP) analgesic gel in acute and subacute musculoskeletal pain.
Materials and Methods: The present study was conducted at the Rehabilitation Center of a tertiary referral hospital. A novel herbal gel consisting of Plai, Longan seed, Arnica, and Immortelle extracts was developed. One hundred four patients with acute and subacute musculoskeletal pain, with a numerical rating scale (NRS) of 3 or less, were randomized to two equal groups with the treatment group and control group, both having 60 patients each. The treatment group received I-ALP analgesic gel with rehabilitation and a physical therapy program while the control group received placebo gel with rehabilitation and a physical therapy program. Both groups were instructed to apply analgesic gel in the painful area twice a day, in combination with the rehabilitation and physical therapy program, three times a week for two weeks. Both groups were assessed for NRS score, active range of motion, and quality of life in pretest, during the test at one week, and post-test at two weeks.
Results: Ninety-five patients completed the experimental study, with 50 in the intervention group and 45 in the placebo group. Four herbal extracts, including Plai extract 14%, Longan seed extract 8%, Arnica extract 5%, and Immortelle extract 4%, were developed as the I-ALP analgesic gel. The present study found that the treatment group had significant reduction in pain response rate (p<0.05). Within one week, 26% of the treatment group had a reduction of NRS scores of 50%. At post two weeks, 88% of the treatment group had reduction of NRS scores of 50%. The number of patients in the treatment group who had reduced pain response rate was up to 3.67 times greater than in the control group (95% confidence interval 1.33 to 11.28). There was no significant difference in quality-of-life scores between the two groups.
Conclusion: The I-ALP analgesic gel effectively reduces pain in patients with musculoskeletal pain in acute and subacute phases.

Received 30 October 2023 | Revised 9 July 2024 | Accepted 12 July 2024
DOI: 10.35755/jmedassocthai.2024.9.730-738-286

Keywords : Acute pain; Subacute pain; Musculoskeletal pain; I-ALP; Analgesic gel


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