Voltarol Back and Muscle Pain Relief 1.16% Gel, Voltarol Osteoarthritis Joint Pain Relief 1.16% Gel (for non-serious arthritic conditions), Voltarol Joint Pain Relief 2.32% Gel and Voltarol 12 Hour Joint 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. Always read the label. Voltarol 140 mg Medicated Plaster for relief of pain and inflammation contains diclofenac sodium. Always read the label. Do not use on children under 16 years.