This study evaluated the toxicity of ciprofloxacin to spleen and liver when used for the treatment of mice infected with S. typhi for seven days. The dose concentration used in these experiments was 100mg/kg. Mice were divided into two groups . The first group (negative control) was not given ciprofloxacin, but rather a sterile phosphate buffer solution (PBS) as an alternative. Ciprofloxacin was administered to the second group. After seven days , the animals were sacrificed and organs (liver and spleen) were collected . The histopathological examination showed normal hepatocytes in the liver  and normal structure of  spleen cells in animals of control group . However, the treated group showed dilated and congested blood vessels with perivascular inflammatory cell cuffing and acute cell swelling  in the liver, as well as white pulp activation with an increased number of megakaryocyte cells in the spleen. Therefore, the current study suggests that  the concentration of 100 mg/kg of ciprofloxacin is considered to be toxic to  hepatocytes and splenocytes of mice  during the treatment period.