Abstract
Concentration in the serum and urinary excretion of cephapirin were studied. After injection of cephapirin intravenously (20 mg/kg) to rabbits, the concentration of the drug in serum decreased with a half-time of 20 minutes, and after intramuscular injection about one hour. About 50% of the drug injected was excreted in urine within 6 hours. Concentration in the serum of other cephalosporin group drugs were estimated comparatively.