Piperacillin

Also Known As: Piperacillin, Pipracil

Piperacillin is an extended spectrum beta-lactam antibiotic of the ureidopenicillin class.

It is normally used together with a beta-lactamase inhibitor such as tazobactam. The combination drug piperacillin/tazobactam is commercially available as e.g. Tazocin, Zosyn, Brodactam, Piptaz and as Trezora. The combination has activity against many Gram-positive and Gram-negative pathogens and anaerobes, including Pseudomonas aeruginosa.

Piperacillin is not absorbed orally, and must therefore be given by intravenous or intramuscular injection. It has been shown that the bacteriocidal actions of the drug do not increase with concentrations of piperacillin higher than 4-6xMIC, which means that the drug is concentration-independent in terms of its actions. Piperacillin has instead shown to offer higher bacteriocidal activity when its concentration remains above the MIC for longer periods of time (50% time>MIC showing the highest activity). This higher activity (present in continuous dosing) has not been directly linked to clinical outcomes, but however does show promise of lowering possibility of resistance and decreasing mortality.[1]

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