Dexamethasone tablets are fluoride-containing glucocorticosteroids, a kind of long-acting glucocorticosteroids, its metabolism time is about 36 hours, so it is said that pregnant women can not take dexamethasone tablets. However, some diseases, such as systemic lupus erythematosus, are prone to relapse during pregnancy and require glucocorticosteroids to control the condition. At this time, medium-acting glucocorticosteroids can be taken, such as prednisone acetate tablets or methylprednisolone tablets, but it is important to note that, below a medium dose, the effect on the child will be small, but large doses will also have adverse reactions, which may have a certain effect on the fetus.