Salonpas Pain Relieving Patch (Methyl Salicylate + Menthol) — a 2024 trial of a related salicylate/camphor topical found it non-inferior to topical diclofenac. After application, methyl salicylate is hydrolyzed in the skin to salicylic acid, providing weak local COX/prostaglandin inhibition together with rubefacient vasodilation (increased skin blood flow), while menthol activates cold-sensing TRPM8 receptors on sensory nerves to produce a cooling sensation that masks pain and desensitizes nociceptors.
Source: CJEM 2025, PMID 40952589 ↗ · Topical Pain Relief · How Magellan grades evidence · Study write-up · evidence confidence: high
Salonpas Pain Relieving Patch delivers two topical counterirritant analgesics through the skin over a painful area: methyl salicylate (a salicylate ester chemically related to aspirin) and menthol, in an occlusive patch formulation approved by the FDA in 2010. After application, methyl salicylate is hydrolyzed in the skin to salicylic acid, providing weak local COX/prostaglandin inhibition together with rubefacient vasodilation (increased skin blood flow), while menthol activates cold-sensing TRPM8 receptors on sensory nerves to produce a cooling sensation that masks pain and desensitizes nociceptors. The combination is sold over the counter for temporary relief of minor muscle and joint aches, strains, sprains, and arthritis pain.
Randomized trials of methyl-salicylate/menthol patches and menthol-based topical products show modest, short-term reductions in pain from muscle strain and other musculoskeletal complaints — in the pivotal multicenter trial of this formulation class (208 patients), a single 8-hour patch beat placebo on day-1 pain relief with adverse-event rates similar to placebo — and a large Cochrane overview finds good evidence that some topical analgesics help acute sprains and strains. A 2024 trial of a related salicylate/camphor topical found it non-inferior to topical diclofenac. The evidence is still genuinely mixed: systematic reviews of topical salicylate rubefacients report only moderate-to-poor efficacy for chronic musculoskeletal pain, and long-term data are lacking. These agents are generally well tolerated, but percutaneous salicylate absorption has potentiated warfarin anticoagulation in a case report, and occlusive or misused counterirritant topicals have caused chemical burns. This evidence describes topical menthol and methyl salicylate and their mechanisms in general, not this specific commercial patch.
Peer-reviewed studies on the active compound — citations link to PubMed.
“Findings suggest topical NSAIDs may be effective and well tolerated for managing acute musculoskeletal pain; interventions included ketoprofen gel, methyl salicylate/1-menthol patch, and diclofenac epolamine patch.”
“Both ibuprofen/levomenthol and diclofenac gels provided superior global pain relief compared with ibuprofen gel, with a shorter median time to significant pain relief. Only ibuprofen/levomenthol gel provided cooling for up to 2 hours.”
“The primary efficacy analysis (SPID8 with movement) indicated that patients receiving the active patch experienced significantly greater pain relief (approximately 40%) than those patients receiving a placebo patch (mean [SD], 182.6 [131.2] vs 130.1 [144.1]; P = 0.005).”
“At day 14, TG pain severity score and pain interference score decreased (49% and 58.1%, respectively).”
“A menthol-based topical analgesic increased PPT (decreased pain sensitivity) overall (P = .05; 11.6% [2.4%]; d = 1.05) and PPT was higher (P < .0001; 31.5%-44.2%; d = 1.03-1.8) for lower versus upper body locations.”
“No significant improvement was observed with topical 1% diclofenac/3% menthol gel compared with placebo, 1% diclofenac, or 3% menthol gel in treating pain from ankle sprain.”
Research describes the active mechanism and is not a claim about this specific product.
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Yes — its active compound is linked to 18 peer-reviewed studies, summarized and cited above.
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