In the article entitled “The Effect of Acetylcysteine on Renal Function in Experimental Models of Cyclophosphamide and Ifosfamide-Induced Cystitis” published in Current Urology 2020;14(3):150–162 (DOI: 10.1159/000499245), the following Statement of Ethics was omitted: “The study was conducted in compliance with institutional ethical guidelines for the care, welfare and use of animals. The study was carried out in accordance with European legislation (Directive of the European Parliament and Council 2010/63/EU of 22 September 2010 on the protection of animals used for scientific purposes) and Polish legislation (Act of 15 January 2015 on the protection of animals used for scientific or educational purposes). The study was carried out with the consent of the 2nd Local Ethical Committee of the Institute of Pharmacology of the Polish Academy of Science in Krakow (resolution No. 154/2017 of 17 May 2017).” We apologize for this error and any inconvenience this may have caused.