Diclofenac sodium extended-release capsules are non-steroidal anti-inflammatory drugs with anti-inflammatory and analgesic effects. It is often used clinically to treat the relief of swollen and painful joints caused by acute attacks of various chronic arthritis such as rheumatoid arthritis, osteoarthritis, spondyloarthropathy, gouty arthritis, and rheumatoid arthritis. It can also be used for various soft tissues, such as rheumatic pain, tenosynovitis, synovitis, myalgia, and post-exercise injury pain. It can also be used for acute moderate or severe pain, such as surgery, or primary dysmenorrhea, toothache, headache, etc. These pains can be applied. Its main adverse reaction is gastrointestinal reaction, so it can be taken after meals to reduce the stimulation of the gastrointestinal tract. There are also adverse reactions such as dizziness and drowsiness in the nervous system, but they are not common, and a small percentage of them can cause electrolyte disorders and other adverse reactions.