Pharmacological Effects of β-Lactam Antimicrobial: A Comprehensive Literature Review on Pharmacokinetics, Pharmacodynamics, and Resistance Mechanisms
Amir Emami* and Abdollah Bazargani
ABSTRACT
β-lactam antibiotics represent one of the most extensive classes of antimicrobial agents in modern medicine, due to their broad activity, favorable safety profiles, and well-established clinical efficacy. These agents – including penicillins, cephalosporins, carbapenems, and monobactams – exert their antibacterial effects by inhibiting the synthesis of the cell wall of bacteria through binding to penicillin-binding proteins (PBPs). Despite their widespread application, the advent of resistance mechanisms such as β-lactamase production, altered PBPs, and efflux pumps have significantly compromised their therapeutic potential.
This literature review aims to provide a comprehensive analysis of the pharmacological properties of β-lactam antibiotics, with a particular focus on pharmacokinetics (PK), pharmacodynamics (PD), and resistance mechanisms. The review synthesizes findings from peer-reviewed studies published over the past two decades, highlighting the importance of PK/PD optimization in clinical decision-making. Time-dependent killing, a hallmark of β-lactam activity, underscores the need for dosing strategies that maintain drug concentrations above the minimum inhibitory concentration (MIC) for an adequate duration.
Furthermore, the review explores current challenges in β-lactam therapy, including suboptimal dosing in critically ill patients, diagnostic delays in resistance detection, and gaps in antimicrobial stewardship. Future research directions are proposed, such as the development of novel β-lactamase inhibitors, personalized dosing regimens based on PK/PD modeling, and rapid diagnostic tools for resistance profiling. By integrating pharmacological insights with clinical practice, this review seeks to inform strategies that preserve the efficacy of β-lactam antibiotics in an era of escalating antimicrobial resistance.
