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  • Title: Pharmacokinetics of ceftriaxone after intravenous infusion and intramuscular injection.
    Author: Scully BE, Fu KP, Neu HC.
    Journal: Am J Med; 1984 Oct 19; 77(4C):112-6. PubMed ID: 6093511.
    Abstract:
    The pharmacokinetics of ceftriaxone were evaluated in eight adults after doses of 1 g administered by intravenous infusion and 1 and 0.5 g administered by intramuscular injection. Mean peak plasma concentrations were 168 micrograms/ml for 1 g given intravenously, 81 micrograms/ml for 1 g given intramuscularly, and 46 micrograms/ml for 0.5 g intramuscularly. Plasma concentrations were similar by both high pressure liquid chromatographic and microbiologic methods. The plasma half-lives were 7.6 and 8.3 hours, respectively, for the intravenous infusion and intramuscular injection. Plasma concentrations were equal for the 1 g intravenous and intramuscular routes by 2.5 hours. Plasma concentrations exceeded the minimal inhibitory concentrations (MICs) of most aerobic gram-positive and gram-negative organisms with the exception of Pseudomonas aeruginosa and Acinetobacter species for 24 hours. Urinary concentrations exceeded 100 micrograms/ml for 24 hours for the 1-g doses and for 12 hours for the 0.5-g dose. Urinary recovery of ceftriaxone within 24 hours was 40 percent for intravenous infusion and 33 and 34 percent for the intramuscular injection. A single 1-g dose daily will exceed the MICs of most staphylococcal and streptococcal species and Enterobacteriaceae for 12 to 24 hours.
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