Paeonia lactiflora refers to Paeonia lactiflora capsules, whose clinical application is for the treatment of rheumatoid arthritis. The main ingredient of Paeonia lactiflora capsule is Paeonia lactiflora, which belongs to a kind of immunomodulator. In the clinic, this drug is mainly used to treat rheumatoid arthritis. In addition, this drug can also be used clinically to treat autoimmune diseases such as systemic lupus erythematosus and dry syndrome. Adverse reactions such as loose stools, increased frequency and mild abdominal pain may occur after taking this drug, but most of them can disappear on their own. In addition, it is forbidden for those who are allergic to the components of the drug and pregnant women; lactating women, the elderly, and children should be used with caution. It should be noted that this drug is a prescription drug and needs to be taken correctly under the guidance of a doctor. If an adverse reaction occurs after taking the drug, it is recommended to consult a doctor in time.