Amphotericin B is an antifungal, produced by Streptomyces nodosus. It prevents the growth of fungi by causing an increase in fungal plasma membrane permeability. It actively binds to sterols and leads to the formation of pores. It is used to prevent the contamination of cell cultures by yeast and multicellular fungi. Amphotericin B contains 250 µg of amphotericin B and 205 µg of sodium deoxycholate per mL of distilled water. The recommended working concentration ranges from 0.25 to 2.50 µg/mL.