For this product we require a completed Drug & Chemical Affidavit on file. If you have not submitted this form to us, please click here, and fax (813-671-8237) or email (fishsupplies@verizon.net) back to us. Thank You. See Furazolodone, 1 kg.Used as a protozoacide and bactericide.Furazolidone is an antibacterial, possessing both bacteriostatic and bacteriocidal properties. It is active against various gram-negative and gram-positive bacteria pathogenic to fishes. It is indicated for the control of Aeromonas salmonicida (furunculosis) and other bacterial pathogens. Furazolidone has also been shown to have an inhibitory effect on spore formation of the sporozoan Myxosoma, when administered orally. Info from Novalek