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It is well known that the bactericidal effect of β-lactam antibiotics is closely related to the time which the serum concentration of the antibiotic remains above the minimal inhibitory concentration of the target pathogen. Thus, the optimal administration of β-lactam antibiotics would be the continuous infusion of the drug.We present a case report with a critically ill double-lung transplanted patient with pneumonia due to a multidrug- resistant Pseudomonas aeruginosa who received continuously 8 g meropenem/24 hr. Based on a previous pharmacokinetic study showing that continuous infusion of meropenem is at least equivalent to intermittent administration this case report is reported to demonstrate the clinical efficacy of continuous infusion.C-reactive protein and pneumonia decreased rapidly when clinical conditions were improved significantly. Continuous administration of meropenem did not interfere with cyclosporine, no side effects were seen, and the patient’s renal function was not impaired during the whole period of treatment.The continuous administration of β-lactam antibiotics is a powerful application in critically ill patients to intensify antimicrobial therapy.