Sandimmun (ciclosporin A) treatment of chronic glomerulonephritis with nephrotic syndrome in a dose 2.5-5 mg/kg for 6-10 months relieved nephrotic syndrome in 2 and resulted in clinical improvement in other 2 of 4 patients treated. In 3 cases the patients failed previous therapy with high-dose corticosteroids and cytostatics. The drug reduced proteinuria, elevated serum levels of albumin and total protein, had low nephrotoxicity.