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  • Title: Serum and tissue cage fluid concentrations of ciprofloxacin after oral administration of the drug to healthy dogs.
    Author: Walker RD, Stein GE, Hauptman JG, MacDonald KH, Budsberg SC, Rosser EJ.
    Journal: Am J Vet Res; 1990 Jun; 51(6):896-900. PubMed ID: 2195927.
    Abstract:
    Ciprofloxacin, a fluoroquinolone antimicrobial agent, was administered orally to 4 healthy dogs at dosage of approximately 11 and 23 mg/kg of body weight, every 12 hours for 4 days, with a 4-week interval between dosing regimens. Serum and tissue cage fluid (TCF) concentrations of ciprofloxacin were measured after the first and seventh dose of each dosing regimen. The peak concentration was greatest in the serum after multiple doses of 23 mg/kg (mean +/- SEM; 5.68 +/- 0.54 micrograms/ml) and least in the TCF after a single dose of 11 mg/kg (0.43 +/- 0.54 micrograms/ml). The time to peak concentration was not influenced by multiple dosing or drug dose, but was longer for TCF (6.41 +/- 0.52 hour) than for serum (1.53 +/- 0.52 hour). Accumulation of ciprofloxacin was reflected by the area under the concentration curve from 0 to 12 hours after administration (AUC0----12). The AUC0----12 was greatest in the serum after multiple doses of 23 mg/kg (31.95 +/- 1.90 micrograms.h/ml) and least in the TCF after a single dose of 11 mg/kg (3.87 +/- 1.90 micrograms.h/ml). The elimination half-life was not influenced by multiple dosing or dose concentration, but was greater for TCF (14.59 +/- 1.91 hours) than for serum (5.14 +/- 1.91 hours). The percentage of TCF penetration (AUCTCF/AUCserum) was greater after multiple doses (95.76 +/- 6.79%) than after a single dose (55.55 +/- 6.79%) and was not different between doses of 11 and 23 mg/kg. Both dosing regimens of ciprofloxacin resulted in continuous serum and TCF concentrations greater than 90% of the minimal inhibitory concentration for the aerobic and facultative anaerobic clinical isolates tested, including Pseudomonas aeruginosa.
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