Voltaren Extra Strength gel has 2.32% diclofenac diethylamine (NSAID). It is an anti-inflammatory drug. The double strength works longer than regular strength. It relieves muscle and joint pain by regular application in intervals of 12 hours. https://www.andrewlunnphotography.com/blog/2015/2/london-white-collar-boxing-at-gym-box-holborn-saparing-session