Voltarol Emulgel P 1% w/w Gel contains the active ingredient diclofenac which is from the group of medicines called non-steroidal anti-inflammatory drugs (NSAIDs). Voltarol Emulgel P 1% w/w Gel is used to relieve pain and reduce swelling in a number of painful conditions affecting the joints and muscles, e.g. sprains, strains and bruises. It is also used to relieve the pain of muscular rheumatism.