Voltarol Pain-eze Emulgel works by blocking the production of some of the body’s chemicals that cause swelling (inflammation), pain and tenderness. It contains a non-steroidal anti-inflammatory drug (NSAID) called diclofenac, which targets pain at its source to provide fast and effective pain relief. Advanced Emulgel technology The Emulgel technology helps the gel to penetrate deeply into the skin to enhance delivery of diclofenac to the point of pain, helping you to feel better. Easy to use This gel has a pleasant smell and is stain-free. It is easily absorbed into the skin and is neither greasy or sticky.