Etoricoxib, Linseed Oil , Menthol and Methyl Salicylate. Etoricoxib is a non-steroidal anti-inflammatory drug (NSAID) which works by blocking the release of certain chemical messengers in the brain that cause pain and inflammation (sweling). Linseed Oil is a plant-based oil which reduces swelling and improves blood circulation at the site of application. Additionally, it increases the penetration of Etoricoxib through the skin. Menthol and Methyl Salicylate are topical analgesics (pain relievers). They work by first cooling the skin, then warming it up. This action further increases blood circulation and distracts from feeling the pain.