Diclofenac is a non-steroidal anti-inflammatory drug (NSAID) that is used to reduce swelling and treat pain. It is commonly used to treat conditions such as rheumatoid arthritis, osteoarthritis, sprains, back pain, migraine, and gout. Diclofenac is available in various forms, including tablets, capsules, gels, plasters, injections, and eyedrops. It works by reducing hormones that cause inflammation and pain in the body. It usually takes 20 to 30 minutes to work when taken as tablets or capsules