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The pharmacokinetics of florfenicol, a structural analogue of thiamphenicol, were studied in six pigs after single oral and intramuscular doses of 15 mg/kg bodyweight, and after feeding them with medicated feed containing 250 mg/kg for three days, a concentration which provided approximately the same dose rate of the drug. The oral doses contained a specially prepared pelleted formulation of the drug. The bioavailability of the drug was similar for the oral and intramuscular doses. Florfenicol was absorbed rapidly from the feed and its concentration in plasma remained between 2 and 6 microg/ml - above the minimum inhibitory concentration values for common pig pathogens - during the three days.
Vet Rec 1999 Oct 02
PMID:Pharmacokinetics of florfenicol after treatment of pigs with single oral or intramuscular doses or with medicated feed for three days. 1057 73

The objective of the study was the safety and efficacy evaluation of a new 450 mg/ml florfenicol formulation in the treatment of naturally occurring respiratory disease when administered intramuscularly, compared with a positive control group treated with the well-established 300 mg/ml formulation. A total of 174 calves, selected from five sites in France and Spain, aged from 1 to 17 months, showing severe signs of respiratory disease, were randomly assigned to treatment with either the 300 mg/ml (3 ml/45 kg; Nuflor; MSD Animal Health) or 450 mg/ml (2 ml/45 kg; Nuflor Minidose; MSD Animal Health) florfenicol formulation, both administered intramuscularly twice, two days apart. Animals were clinically observed daily for 14 days following treatment initiation. The predominant pathogens present in pretreatment respiratory tract samples were Mannheimia haemolytica and Pasteurella multocida. Mycoplasma bovis and Histophilus somni were also present. All isolates were subjected to in vitro sensitivity testing and found susceptible to florfenicol. In both treatment groups, rectal temperature dropped and clinical index (depression and respiratory signs) significantly improved (P<0.05) after treatment. As a result, 97.7 per cent of the 450 mg/ml florfenicol formulation-treated animals were considered treatment successes on day 5. On day 14, 67.82 per cent of the animals were classified as treatment successes and among them 63.22 per cent were cured. The intramuscular injection of the new 450 mg/ml florfenicol formulation was found equally efficacious as the original 300 mg/ml formulation.
Vet Rec 2011 Nov 12
PMID:Efficacy and safety of a new 450 mg/ml florfenicol formulation administered intramuscularly in the treatment of bacterial bovine respiratory disease. 2192 Oct 60

The efficacy and safety of a florfenicol plus flunixin meglumine formulation in the treatment of respiratory disease was evaluated in calves less than six weeks of age, compared with a positive control group treated with a well-established florfenicol formulation. A total of 210 calves, selected from nine sites in Belgium, France and Spain, showing severe signs of respiratory disease, were randomly assigned to treatment with either florfenicol plus flunixin meglumine (Resflor; MSD Animal Health) or florfenicol (Nuflor; MSD Animal Health), both administered subcutaneously once. Animals were clinically observed daily for 10 days following treatment initiation. The predominant respiratory pathogens were Pasteurella multocida, Mycoplasma bovis, Mannheimia haemolytica and Histophilus somni. All isolates were subject to in vitro sensitivity testing and found susceptible to florfenicol. In both groups, rectal temperature dropped and clinical index (depression and respiratory signs) significantly improved after treatment. Specifically, for the change in rectal temperature from pretreatment to six hours post-treatment, the florfenicol-flunixin formulation was found significantly superior to florfenicol. Moreover, the florfenicol-flunixin formulation alleviated the clinical signs of disease more rapidly, and was demonstrated to be non-inferior to florfenicol on days 4 and 10. The use of the product combining florfenicol and flunixin in calves is safe and efficacious in the treatment of outbreaks of bovine respiratory disease.
Vet Rec 2014 Apr 26
PMID:Treatment of naturally occurring bovine respiratory disease in juvenile calves with a single administration of a florfenicol plus flunixin meglumine formulation. 2460 64