Piperacillin is a broad-spectrum β-lactam antibiotic of the ureidopenicillin class. The chemical structure of piperacillin and other ureidopenicillins incorporates a polar side chain that enhances penetration into Gram-negative bacteria and reduces suscep + some more technical info. The polar acylureido side chain increases outer membrane permeation and improves binding affinity for specific penicillin binding proteins, producing bactericidal inhibition of peptidoglycan cross-linking. Piperacillin displays extended activity against many Gram-negative rods including Pseudomonas aeruginosa and retains activity versus a range of Gram-positive cocci. It is administered parenterally because the β-lactam ring is acid labile and poorly absorbed orally. Pharmacokinetics are characterized by rapid distribution, predominant renal excretion of unchanged drug, and a relatively short elimination half-life in subjects with normal renal function. Like other β-lactams, piperacillin is susceptible to hydrolysis to penicilloic acids and related degradation products; pairing with a β-lactamase inhibitor such as tazobactam broadens utility against β-lactamase producing strains and reduces inactivation by many serine β-lactamases.
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Parent: Piperacillin
Typical quality-control criteria for piperacillin active pharmaceutical ingredient follow pharmacopeial style limits for related substances: individual unidentified impurities are commonly limited to not more than 0.5 percent by area in a validated HPLC assay and the sum of all impurities is typically limited to not more than 2.0 percent, with tighter limits applied to specified known degradants. Common related compounds and degradation products include the corresponding penicilloic acid produced by β-lactam hydrolysis, deacylated or N-dealkylated derivatives, epimers at the 6-position, and low-level dimeric or rearrangement products; specified known impurities are controlled with individual acceptance criteria (for example 0.1 to 0.5 percent depending on impurity identity and toxicity assessment) and monitored by stability-indicating chromatographic methods. Identification, quantitation, and limits should follow the applicable pharmacopeia monograph and ICH Q3A/Q3B guidance and be adjusted for the formulation context such as combination with tazobactam.
Piperacillin is used to treat serious bacterial infections caused by susceptible organisms, including complicated intra-abdominal infections, hospital-acquired and ventilator-associated pneumonias, complicated skin and soft tissue infections, and severe urinary tract infections; it is frequently used in combination with a β-lactamase inhibitor to extend coverage against β-lactamase producing bacteria.
Penicillin refers to the core class of β-lactam antibiotics derived from penicillium species and generally has a narrower spectrum, while piperacillin is a synthetic ureidopenicillin with a polar acylureido side chain that expands Gram-negative coverage, enhances penetration into Gram-negative bacteria, and increases affinity for certain penicillin binding proteins; piperacillin is typically reserved for more severe or resistant Gram-negative infections.
Piperacillin-tazobactam should not be used in patients with a known hypersensitivity to piperacillin, other penicillins, or β-lactamase inhibitors; caution or alternative therapy is required for patients with a history of severe immediate hypersensitivity reactions to any β-lactam. Dose adjustments or avoidance are necessary in severe renal impairment and in patients at high risk for Clostridioides difficile infection or who have a history of severe hepatic dysfunction according to clinical judgment.
Piperacillin is administered parenterally, most commonly by intravenous infusion and less frequently by intramuscular injection, because it is unstable in the gastric environment and not reliably absorbed after oral administration.
