Oxytetracycline belongs to the group of tetracyclines and acts bacteriostatic against many Gram-positive and Gram-negative bacteria like Bordetella,Campylobacter,Chlamydia,E.coli,Haemophilus,Mycoplasma,Pasteurella,Rickettsia,Salmonella,Staphylococcus and Streptococcus spp.

The action of oxytetracycline is based on inhibition of bacterial protein synthesis. Oxytetracycline is mainly excreted in urine, for a small part in bile and in lactating animals in milk.