Pharmacokinetics and tissue penetration of orally administered lomefloxacin.
The pharmacokinetics of the quinolone lomefloxacin were determined following a single 400-mg oral dose given to each of six male volunteers. Concentrations in serum, urine, and cantharidin-induced inflammatory fluid were determined by a microbiological assay. Samples from two volunteers were also assayed by high-performance liquid chromatography. The mean peak level in serum, 4.7 micrograms/ml, was attained within 1 h of administration. The mean elimination half-life from serum was 7 h. Inflammatory fluid was penetrated rapidly, with a mean peak level of 3.5 micrograms/ml occurring after 2.7 h. The mean recovery of lomefloxacin from urine over 48 h was 76% of the administered dose. There was a minor peak on the high-performance liquid chromatography trace, suggesting a small amount of unidentified metabolite. This was present only in urine; no detectable metabolites were found in serum. This study suggests that either once-daily or twice-daily dosage of lomefloxacin should be sufficient to treat urinary or systemic infections, respectively, caused by susceptible pathogens.
Stone
J W
JW
Department of Medical Microbiology, Dudley Road Hospital, Birmingham, England.
Andrews
J M
JM
Ashby
J P
JP
Griggs
D
D
Wise
R
R
D042462:4-Quinolones; D000284:Administration, Oral; D000328:Adult; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D001826:Body Fluids / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D024841:Fluoroquinolones; D006207:Half-Life; D006801:Humans; D008297:Male; D015363:Quinolones; D014552:Urinary Tract Infections / Q000188:drug therapy
D042462:4-Quinolones; D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; C053091:lomefloxacin