Thiofuradene (also known as Furidin) is a imidazolidinethione derivative patented by Norwich Pharmacal Co. as an anthelmintic and growth stimulant. Thiofuradene exerts favor influences on combating Pasteurella multocida, Eimeria tenella, and other infections. Thiofuradene added in a dose of 30 mg/day to the ration for 5 to 30 days increased the egg production of chickens several days after the beginning of its administration.