Fitalin ointment that is diclofenac diethylamide latex, the topical medication on ankylosing spondylitis can play a relatively limited therapeutic role, ankylosing spondylitis treatment is based on oral medication. Ankylosing spondylitis is a chronic inflammatory disease that mainly involves the large joints of the limbs, the spine and the central axis of the skeleton, which can lead to peripheral connective tissue fibrosis, ossification and joint ankylosis at the site of the lesion, and cause the patient to experience morning stiffness, back pain and joint swelling and pain and other clinical symptoms, and the treatment of this disease is based on oral drug therapy and surgical treatment. Oral medications commonly used in the treatment of ankylosing spondylitis are non-steroidal anti-inflammatory drugs (NSAIDs) such as diclofenac and meloxicam, and anti-rheumatic drugs such as etanercept and adalimumab, etc. Topical medications such as diclofenac diethylamide latex are relatively limited to the treatment of this disease and are not included in the current main treatment program. Diclofenac diethylamide latex is used to relieve mild to moderate pain in muscles, soft tissues and joints. It is also used in the symptomatic treatment of osteoarthritis. Occasionally, local adverse reactions, allergic or non-allergic dermatitis such as papules, skin redness, edema, itching, blisters or scaling may occur. It is contraindicated in those who are allergic to other NSAIDs, those who are allergic to isopropyl alcohol or propylene glycol and other excipients and in the last trimester of pregnancy. Be careful to use the dosage in strict accordance with the instructions and avoid prolonged extensive use. Diclofenac diethylamide emulsion should be used under the guidance of a physician, it is recommended that patients with ankylosing spondylitis to the rheumatology and immunology department of the regular hospital for detailed consultation, and follow the doctor’s instructions for treatment.