There is no clear time for how long it takes to see the effect of taking mortimecoxib dispersible tablets for dermatomyositis, usually about three months, but due to the existence of individual differences may take longer or shorter time to take effect. Mottimecolate Dispersible Tablets is a kind of immunosuppressant, and its drug insert does not point out that there is dermatomyositis in its indications, but our 2019 rheumatology expert consensus suggests that Mottimecolate Dispersible Tablets can be used in the treatment of inflammatory myopathies. There is no literature, guideline or expert consensus that suggests a definitive time for the onset of effect of moratimecoate dispersible tablets for the treatment of dermatomyositis. Clinical experience suggests that the onset of action is usually around three months, but may be longer or shorter due to individual differences. Some patients may experience adverse reactions such as diarrhea, vomiting, leukopenia, sepsis, etc. after taking MORTIMERS. It is contraindicated in women during pregnancy, and should be used by nursing women under the supervision of a physician. Note that rapid or push administration of this injection through the vein is prohibited. Matemacrolate needs to be taken under the guidance of a professional doctor, do not use it privately. It is recommended that patients with dermatomyositis consult the rheumatology and immunology department in a timely manner, under the guidance of a doctor for standardized treatment and regular follow-up.