Get instant back and muscle pain relief with Voltarol Back and Muscle Pain Relief Gel. The gel contains diclofenac diethylammonium. It helps to restore movement and reduce inflammation. Usage: 1. Read the package leaflet before use. 2. Use an amount the size of one penny or two penny pieces, rub gently and apply 3-4 times daily to the affected area. 3. Massage into the skin over the affected site. 4. Wash hands after use (unless they are on the site being treated). Adults and children aged 14 and over: Do not use for more than 7 days unless longer treatment is recommended by a doctor. If symptoms persist for longer than 7 days, consult your doctor.