Leflunomide tablets are usually taken 10mg or 20mg (usually one or two tablets) per day, which needs to vary according to the type of disease, drug specifications, and manufacturer. Leflunomide tablets are suitable for adults with rheumatoid arthritis and have the effect of improving the condition, and can also be used for lupus nephritis. When used for adult rheumatoid arthritis, leflunomide is usually administered 24 hours apart due to its long half-life. In order to quickly achieve a stable blood concentration, often in the first 3 days of treatment is given to the loading dose of 50mg per day, and then can be given according to the specific conditions of the maintenance dose, 10mg or 20mg per day, 3 months for a course of treatment. When used for sore nephritis, the appropriate dose should be chosen according to the specific condition, usually 20-40mg once a day, and the dosage should be reduced appropriately after the condition is relieved. In addition, leflunomide tablets can lead to diarrhea, itching, elevated liver enzymes, skin rash and other adverse reactions. This drug and its metabolites allergy, severe liver injury, lactating women are prohibited. At the beginning of the medication, you should pay attention to checking the blood routine and liver function. People younger than 18 years of age are advised not to take this drug. Leflunomide tablets should be taken according to the specific condition, under the guidance of the doctor, on time and in accordance with the dosage, do not self-medicate.