The antibacterial spectrum of erythromycin thiocyanate is similar to that of benzylpenicillin. It has strong effect to staphylococcus aureus, streptococcus and pneumoniae bacteria in gram-positive bacteria, and also has some effect to pasteurella and brucella in gram-negative bacteria. In addition to that, the product is effective to mycoplasma, rickettsia, leptospira, actinomycetes and ardia, but non-effective to echerichia coli, salmonella spp and other intestinal negative bacteria. It is mainly used for serious infections caused by drug-resistant Staphylococcus aureus and hemolytic streptococcus, such as pneumonia, septicemia, endometritis and mastitis etc. Besides it also has good effect on mycoplasma-caused chronic respiratory disease in poultry and swine mycoplasma pneumonia. Moreover it is also used for nocardiosis treatment of dogs and cats, for prevention of white head and mouth disease of black, grass, bighead carp and other fish species, bacterial gill disease of grass and black carp, white fish disease of silver, bighead carp and other fish, and streptococcus disease of tilapia.