Antimicrobial resistance has become a global problem and Strategies to improve the current situation necessitate finding new and innovative antimicrobial agents. Forty apparently healthy albino mice of either sex, weighing between 19kg and 27kg, aged 2 to 3 weeks were purchased and the various concentration of the extracts from Moringa oleifera leaves were given orally to the mice, the highest mean PCV was recorded in 800mg (33.0±1.22), White blood cell count 400mg (3,725±923.20), Neutrophil count 100mg (24.8±7±.65) and lymphocytes count 400mg (87.5±1.85), ethanol extracts had PCV to be highest in 200mg, White Blood Cell WBC 100mg (14,000±9453.4), neutrophils count 400mg(12.8±2.02) and lymphocytes count 800mg (91.5±2.22), the antimicrobial activity of the extracts on clinical isolates showed that the water extract 800mg/ml had the highest zone of inhibition of 6mm on the Escherichia coli, 19mm against Staphylococcus aureus, 18mm against Proteus mirabilis and 14mm against Escherichia coli, the ethanol extracts 800mg/ml had the highest zone of inhibition of 8mm against Salmonella typhii. 6mm against E.coli and S.aureus and 5mm against P.mirabilis, The phytochemical screening showed that both water and ethanol extracts had Flavonoid, Tannin, Glycoside, Terpenoid and Saponin with the absence of alkaloids in water, while reducing sugar was absent in both with Terpenoid having the highest concentrations in ethanol extracts 12.95mg/g and water extracts10.30mg/g.