Voltarol Back & Muscle Pain Relief 1.16% Gel, Voltarol Osteoarthritis Joint Pain Relief 1.16% Gel (for non-serious arthritic conditions), Voltarol Joint & Back Pain Relief 2.32% Gel and Voltarol Max Strength Pain Relief 2.32% Gel contain diclofenac diethylammonium, and can be used for muscular / joint pain relief. Do not use on children under 14 years. Voltarol 140mg Medicated Plaster contains diclofenac sodium for relief of sprains and strains. Do not use on children under 16 years. Always read the label.