Related Experiment Video
Updated: Aug 11, 2026
12:08
Multi-scale Analysis of Bacterial Growth Under Stress Treatments
Published on: November 28, 2019
Cefadroxil, a new broad-spectrum cephalosporin
Antimicrobial Agents and Chemotherapy
|February 1, 1977
Summary
Cefadroxil, a new oral cephalosporin antibiotic, demonstrates broad-spectrum antibacterial activity comparable to existing drugs. It shows promising efficacy in treating experimental infections, with favorable pharmacokinetic properties.
Area of Science:
- Pharmacology
- Microbiology
- Infectious Diseases
Background:
- Cefadroxil is a novel semisynthetic cephalosporin antibiotic.
- It possesses a broad antibacterial spectrum and potential for oral chemotherapy.
Purpose of the Study:
- To evaluate the in vitro and in vivo antibacterial efficacy of cefadroxil.
- To compare its performance against established cephalosporins like cephalexin and cephradine.
Main Methods:
- In vitro susceptibility testing of cefadroxil against 602 clinical bacterial isolates using Mueller-Hinton medium.
- In vivo efficacy assessment in mouse models of experimental infections.
- Pharmacokinetic analysis of cefadroxil and cephalexin blood concentrations in mice.
Main Results:
- Cefadroxil exhibited inhibitory activity similar to cephalexin and cephradine against tested clinical isolates.
- In vivo, cefadroxil was more effective than cephalexin against Streptococcus pyogenes and comparably effective against other key pathogens.
- Cefadroxil achieved comparable or higher peak blood concentrations than cephalexin in mice at tested dosages.
Conclusions:
- Cefadroxil demonstrates significant chemotherapeutic potential as an orally administered antibiotic.
- Its broad-spectrum activity and favorable pharmacokinetic profile suggest it is a viable alternative to existing cephalosporins.
Related Concept Videos
00:57Antibiotic Selection
Overview
01:27Combined Effects of Drugs: Synergism
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
01:22Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence
Generic intravenous (IV) drugs are considered bioequivalent to their branded counterparts due to their 100% bioavailability upon administration. However, variations in stability among different drug products can significantly influence their therapeutic performance, even if they are pharmaceutically equivalent.Cefuroxime, a prophylactic antimicrobial, is often used as a single-dose IV injection for patients undergoing coronary artery bypass grafting surgery. A 3 g dose typically provides...
01:25Mechanism of Antibiotic Resistance in MRSA
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
01:23Inhibitors of Gram-positive Cell Wall Synthesis
Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
01:28Inhibitors of Bacterial DNA Synthesis
Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...