The fertility of 19 patients, 9 men and 10 women, suffering from glomerulopathies and treated with one or more cytostatic drugs – 6‐mercaptopurine, chlorambucil and cyclophosphamide – is studied.Semen analyses and testis biopsies were performed in men. Clinical histories of pregnancies were done in women. In the men permanent or transitory sterility, depending on the total doses of cytostatics, was established. Fertility was not affected in women's fert