Plasma and tissues concentrations were determined by fluorimetric method, after administering the chlortetracycline orally to the Broiler chickens. It was found that the most drug residues were in the liver and kidney. It was observed that citric acid has increased the chlortetracycline absorption in the alimentary tract. The emission maxima of the chlortetracycline was 500 nm and excitation maxima was at 400 nm. The chlortetracycline residues which were determined in the plasma and tissues were observed between 0,007-0,046 µg/g.