It is produced by the strain of Oxytetracycline or Methacycline. It is regarded as the third generation of tetracycline. It shows broad spectrum antibacterial and antiprotozoan activity and acts by binding to the 30S and 50S ribosomal subunits, blocking protein synthesis. Its antibacterial spectrum is similar to Tetracycline, its antibacterial activity is 2-8 times of Tetracycline, its plasma elimination half-life is as long as 18-22h, and it has little effect on renal function. It can be used for the prevention and treatment of domestic animal respiratory diseases and mixed infection of bacterial diseases when respiratory diseases occur.