To observe of the efficacy and safety of early initiation of budesonide enteric coated capsules in the treatment of primary IgA nephropathy.

Inclusion Criteria:

1. Target patients aged 18-75, including those aged 18 and 75
2. Primary IgA nephropathy diagnosed by renal biopsy within 3 months
3. eGFR≥30ml/min/1.73m2
4. 24-hour urine protein ≥ 1.0g/d, or UPCR ≥ 0.8 g/g
5. Sign informed consent

Exclusion Criteria:

1. Including but not limited to secondary IgAN caused by allergic purpura, systemic lupus erythematosus, cirrhosis, rheumatoid arthritis, and ankylosing spondylitis
2. Patients who have received kidney transplantation or dialysis
3. Patients with other glomerular diseases (such as C3 glomerular disease and/or diabetes nephropathy) and nephrotic syndrome (i.e. proteinuria>3.5 g/d, serum albumin<3.0 g/dl, with or without edema)
4. Patients with acute, chronic, or potential infectious diseases, including hepatitis, tuberculosis, human immunodeficiency virus, and chronic urinary tract infections
5. Patients with type 1 or type 2 diabetes diagnosed and poorly controlled (HbA1c>8%)
6. Patients with a history of unstable angina, grade III or IV congestive heart failure, and/or clinically significant arrhythmias
7. Patients with poor blood pressure control (systolic blood pressure ≥ 140mmHg or diastolic blood pressure ≥ 90mmHg)
8. Patients diagnosed with malignant tumors within the past 5 years
9. Patients with known glaucoma, known cataracts, and/or a history of cataract surgery
10. Gastrointestinal diseases that may interfere with the study of drug efficacy or release, such as peptic ulcer disease, inflammatory bowel disease, and chronic diarrhea
11. Patients with severe adverse reactions to steroids in the past, including psychiatric symptoms
12. Patients who have received systemic immunosuppressive drug treatment within 3 months prior to enrollment
13. Patients who have received any systemic GCS treatment within the past 3 months prior to enrollment
14. Patients taking potent cytochrome P450 3A4 inhibitors (CYP3A4)
15. Current or previous (within the past 2 years) alcoholism or drug abuse;
16. Expected lifespan<5 years
17. During the study treatment period and 3-month follow-up period, women who are pregnant, breastfeeding, or unwilling to use highly effective contraception (contraception is only required for women with fertility potential)
18. Researchers believe that patients who are not suitable for treatment with Nefecon

Male or female, aged 18 to 75 years, diagnosed with primary IgA nephropathy through renal biopsy within 3 months, with eGFR ≥ 30ml/min/1.73m2, 24-hour urinary protein ≥ 1.0g/d, and blood pressure<140/90mmHg