1. Common hydrochloride as a yellow crystalline powder, odorless, bitter taste; cited moist; deep when exposed to light color gradient, failure is easily damaged in an alkaline solution. 
2. Antibacterial, breathing disease, the pig lung disease, dysentery for the prevention and treatment of Pasteurella multocida, brucellosis, anthrax, E. coli and Salmonella infections, acute respiratory infections, swine mycoplasma pneumonia. Urinary tract infections caused by susceptible strains, with the clothes vitamin C acidification of the urine. Fairly frequently as feed additives, can prevent the disease, can also improve feed utilization and growth.
3. Tetracycline Hcl can be used for bacillary dysentery (bacillary dysentery), trachoma, whooping cough, purulent meningitis, peritonitis, pneumonia, osteomyelitis. Scarlet fever, typhus, urinary tract infections, skin infections, otitis media, amoebic dysentery, biliary tract infections, intestinal infections, sepsis and so on  3. Tetracycline Hcl can be used in penicillin-resistant strains of infections, penicillin allergy