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Most children diagnosed with nephrotic syndrome show favourable response to corticosteroid therapy, nonetheless 30% of patients have frequent relapses or a steroid-dependent course of disease. Cyclophosphamide, cyclosporin A or MMF are being used in treatment of steroid-dependent nephrotic syndrome in search of a drug with highest long-term effectiveness and least amount of side effects., Aim: The aim of study was to assess of the efficacy of MMF as the first choice immunosuppressive drug in children with nephrotic syndrome after determining a steroid-dependency., Materials and Methods: 23 children with steroid-dependent nephrotic syndrome were enrolled in the study. Mean age at disease onset was 3.8 years. Mean disease duration time before introducing MMF was 21.3 months. Mean treatment time with MMF was 23.6 months. Patients previously treated with immunosuppressive drug, except for prednisone were excluded from the study., Results: Per year of treatment with MMF 56,5% of patients had not more than 1 relapse of the disease, 5 patients had more than 1, but less than 2 relapses. After the mean time of 23.6 months MMF treatment was discontinued in 15 patients (62,5%). 11 patients (48%) from that group significantly benefited from treatment in the form of no further relapses, defer of steroid-dependence or the possibility to reduce the dose of corticosteroids to minimal., Conclusions: MMF has advantage over cyclophosphamide and calcineurin inhibitors in reference to side effect profile, especially glomerular filtration markers, hypertension and frequent drug dependency. Treatment with MMF is effective in maintaining long-term remission and enables the reduction of cumulative steroid dose. Regarding nearly 50% of patients with benefits after MMF treatment and good treatment tolerance, it seems justified to introduce MMF as the first choice immunosuppressive drug in patients with steroiddependent nephrotic syndrome., (© 2018 MEDPRESS.)