Diclofenac diethylamine| Methyl Salicylate| Menthol| Alcohol. Diclofenac diethylamine and Methyl Salicylate are non-steroidal anti-inflammatory drugs (NSAIDs) which work by blocking the release of chemical messengers (prostaglandins) that cause pain and inflammation (redness and swelling). Menthol dilates the blood vessels causing a sensation of coldness| followed by an analgesic effect. Menthol also acts as a penetration enhancer| increasing the penetration of drugs when applied on the skin| to give a faster onset of action. Alcohol acts as an analgesic and anesthetic and can reduce the sensation of both physical and emotional pain.