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ABSTRACT
Antimicrobial agents may interact synergistically when both drugs are present at the infected site for an adequate period of time at sufficient concentrations. Generally speaking, the agents in the combination show different tissue distributions and pharmacokinetics. By co-encapsulation of the drugs in a drug carrier, like liposomes, parallel tissue distributions of both drugs may be ensured and drug concentrations at the site of infection may be increased. In this presentation therapeutic efficacy of liposome-co-encapsulated gentamicin (GN) and ceftazidime (CZ) will be shown in a GN-CZ-susceptible and GN-CZ-resistant Klebsiella pneumoniae-pneumonia in rats.