Antibacterial drug. Mainly treating escherichia coli disease, salmonella disease, caused by pasteurella disease such as scours, typhoid and paratyphoid, mycoplasma and staphylococcus, lost of blood, especially for pericarditis,air vasculitis, perihepatitis caused by chicken severe toxemia and peritonitis, ovarian inflammation for laying fowl, and salpingitis, enteritis, diarrhea,etc.