Learn about Voltaren Gel (Diclofenac Sodium), dosing, proper use and what to know before beginning treatment Health, Household & Baby Care; Industrial & Scientific; Beauty & Personal Care; Grocery & Gourmet Food; Patio, Lawn & Garden; Books; Clothing, Shoes & Jewelry Voltaren Gel, a nonsteroidal anti-inflammatory medication in topical form, is used mostly on knees and hands to relieve arthritis pain and stiffness. Find patient medical information for Voltaren oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Voltaren® Gel is a particularly safe and useful medicine. It’s a topical anti-inflammatory medication, so it can be applied only where you need it, instead of. Voltaren Gel is a topical NSAID used for treating arthritis pain with less risk of side effects. Learn if it may be right for you. Voltaren Gel (diclofenac sodium topical gel) is a topical gel nonsteroidal anti-inflammatory drug (NSAID) used to treat pain of osteoarthritis of joints that are. Voltaren Gel contains diclofenac,a nonsteroidal anti-inflammatory drug (NSAID). Diclofenac works by reducing substances in the body that cause pain and inflammation.