Diclofenac is widely used as a nonsteroidal anti-inflammatory drug (NSAID) to reduce inflammation, pain, and swelling in conditions such as arthritis, including osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. It is also effective in managing acute pain, such as post-surgical pain, dental pain, and migraines. Additionally, it is applied topically in gel or patch form to treat localized pain and inflammation in muscles, joints, or tendons. In ophthalmology, diclofenac eye drops are used to reduce inflammation and pain following eye surgeries or procedures. It is also utilized in veterinary medicine to manage pain and inflammation in animals. However, its use requires careful monitoring due to potential side effects, particularly on the gastrointestinal tract and cardiovascular system.