The pharmacology of orally administered ciprofloxacin

Drugs Exp Clin Res. 1985;11(5):339-41.


Ciprofloxacin pharmacokinetics were studied in 6 volunteers after 250 and 500 mg single oral doses. Mean peak serum levels were 1.45 micrograms/ml and 2.5 micrograms/ml for 250 and 500 mg doses. The 12-h levels were 0.12 micrograms and 0.22 micrograms. T1/2 alpha values were 0.32 and 0.43 h; T1/2 beta was 4 h and Vd (area) values were 80L and 90L for the two doses respectively. AUC was 5.65 h. micrograms/ml and 10.37 h. micrograms/ml. Serum clearance was 23L for both doses. Approximately 49% of the 250 mg dose and 43% of the 500 mg dose was recovered in the urine. Ciprofloxacin's in vitro activity and human pharmacology should permit a twice or once-daily dosing schedule for systemic infections due to most Enterobacteriaceae, Haemophilus, Branhamella and Pseudomonas and S. aureus, and once-daily doses for urinary and gastrointestinal infections.

MeSH terms

  • Administration, Oral
  • Adult
  • Bacteriuria / microbiology
  • Bacteriuria / urine
  • Ciprofloxacin
  • Humans
  • Kinetics
  • Male
  • Quinolines / administration & dosage
  • Quinolines / metabolism*
  • Time Factors


  • Quinolines
  • Ciprofloxacin