Voltral Emulgel contains Diclofenac. It belongs to the class of medications known as nonsteroidal anti-inflammatory drugs (NSAIDs). It works by reducing pain, swelling, and inflammation. Diclofenac topical gel (applied to the skin) is used to relieve pain associated with recent muscle or joint injuries such as sprains, strains, or sports injuries. Diclofenac works to relieve pain and reduce inflammation (swelling). The Emulgel technology helps the gel to penetrate deeply into the skin to enhance delivery of diclofenac to the site of pain.