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The antibacterial properties are similar to those of cefazolin, and it has good antibacterial effects on Staphylococcus (including enzyme-producing strains), Streptococcus pyogenes, Pneumococcus, Escherichia coli, Proteus mirabilis, Haemophilus influenzae, etc. Take 0.25, 0.5 or 1g on an empty stomach, and the peak blood concentrations are 7, 13 or 23 mu;g/ml within 30 to 60 minutes. It is mainly distributed in the blood, internal organs, and skin tissues. The concentration in brain tissue is low. The half-life is 0.6 to 0.9 hours, and the drug is excreted in the urine in its original form. A single oral administration of 0.25g can achieve a peak urine drug concentration of 600 mu;g/ml, and the half-life is slightly prolonged in patients with renal insufficiency. Cefaclor is a second-generation oral cephalosporin. Its antibacterial effect is stronger than that of cefadroxil. Its activity against group A hemolytic streptococci, viridans streptococci and Staphylococcus epidermidis is the same as that of cefadroxil. Its antibacterial activity against pneumococci and non-enzyme-producing Staphylococcus aureus is 2 to 4 times stronger than that of cefadroxil, and its activity against enzyme-producing Staphylococcus aureus is the same. Cefaclor is similar to cefadroxil in activity against Escherichia coli and Klebsiella pneumoniae; but its activity against Proteus mirabilis is significantly stronger than that of cefadroxil, with a MIC90 of 1.82 mg/L. The MIC of this product against Salmonella and Shigella is 0.25 to 1 mg/L, which is 8 times stronger than that of cefadroxil, and the MIC against gonococci is 0.016 to 1 mg/L. Many beta-lactamase-producing influenza bacilli are sensitive to this product; most common Proteus, Serratia, Acinetobacter and Pseudomonas aeruginosa are resistant to this product.