The Journal of antimicrobial chemotherapy
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J. Antimicrob. Chemother. · Jan 2002
Comparative StudyTherapeutic efficacy of intraperitoneal polymyxin B and polymyxin-like peptides alone or combined with levofloxacin in rat models of septic shock.
The efficacy of two polymyxin-like peptides, KFFKFFKFF and IKFLKFLKFL, alone and combined with levofloxacin, was investigated in a rat model of septic shock. Rats were given an ip injection of 2 x 10(10) cfu of Escherichia coli and randomized to receive ip isotonic sodium chloride solution, 7 mg/kg levofloxacin, 1 mg/kg polymyxin B and 1 mg/kg of each polymyxin-like peptides alone or combined with 7 mg/kg levofloxacin. ⋯ Levofloxacin significantly reduced the bacterial growth and TNF-alpha concentration. The combinations of polymyxin-like peptides and levofloxacin demonstrated the highest efficacy.