Salicylic acid: May lead to salicylate toxicity w/ topical & oral salicylates (eg, methyl salicylate-containing products, aspirin). May increase clinical effect of other topical medicines (eg, corticosteroids) by increasing drug penetration into skin. May increase toxicity of acetazolamide, anticoagulants, dipyridamole, heparin, MTX, moxalactam, & hypoglycemics (eg, chlorpropamide, glibenclamide, glimepiride). May decrease efficacy of bumetanide, captopril, probenecid.