Vitamin D is a fat-soluble vitamin with antioxidant and DNA protecting properties , Levofloxacin is a member of the fluoroquinolone drug class, Its broad-spectrum bactericidal effect affects both Gram-positive and Gram-negative bacteria.

The goal of the study is to analyze the haematology analysis in rats received levofloxacin and show the preventive impact of vitamin D3 by analyzing the haematology parameters: packed cell volume (PCV), mean corpuscular hemoglobin concentration(MCHC),haemoglobin (HB), red blood cell (RBC), mean corpuscular volume (MCV),meancorpuscular haemoglobin(MCH), WBC ,differential WBC, and Platelets.

The study included 42 rats divided into 6 groups each group 7 rats. group I negative control : healthy animals received normal saline 0.9%, group II: received levofloxacin LFX dose of 50mg/kg/day (IP) for fourteen days, group III : received LFX 100mg/kg/day (IP) for fourteen days, group IV : received vitamin D3 500 IU/day orally by oral gavage for twenty one days, group V received vitamin D3 500 IU/day orally for twenty one days and levofloxacin 50 mg/kg/day IP injected at day 8 for fourteen days, group VI received vitaminD3 500IU/day for twenty one days orally and levofloxacin 100 mg/kg/day IP injected at day 8 for fourteen days.

  Blood samples taken from rats treated with levofloxacin, showed a decrease in the values of RBC, HB, PCV, MCH, MCHC, as well as a decrease in total white blood cells, then returned approximately to normal levels in the groups IV ,group V and group VI .

from the result of the study conclude that some haematological  changes caused by levofloxacin ameliorated by vitamin D3 may be due to indirect effect of vitamin D3 on haematology parameters.