Oxytetracycline 20% INJ.-100 ML is an antibiotic which is used especially for veterinary purpose. It is known to exert its effect by interfering with protein synthesis which causes bacterial death. This formulation has oxytetracycline as active chemical having molecular formula C22H24N2O9 with a molar mass of 460.434 g/mol. It has elimination half life of about 6 to 8 hours and is excreted via kidney. Oxytetracycline 20% INJ.-100 ML stops spreading of bacterial infection whereas remaining bacteria are destroyed by the immune system. It belongs to the drug class of broad-spectrum tetracycline group of antibiotics.