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Related Concept Videos

Microbiota Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism 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...
Antibiotic Selection00:57

Antibiotic Selection

Overview
Pharmacokinetic–Pharmacodynamic Relationship: Influence of Elimination Half-Life on Effect Duration01:23

Pharmacokinetic–Pharmacodynamic Relationship: Influence of Elimination Half-Life on Effect Duration

Drug elimination from the body primarily occurs through metabolic and excretion pathways. Hepatic metabolism transforms lipophilic drugs into hydrophilic forms for excretion, typically via enzymatic processes classified as phase I (modification) and phase II (conjugation). Renal excretion eliminates drugs and metabolites through filtration and secretion in the kidneys. Impairment in liver or kidney function can hinder these processes, delaying drug clearance and extending the drug’s half-life.
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
Combined Effects of Drugs: Synergism01:27

Combined 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...

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Related Experiment Video

Updated: Jun 6, 2026

Antibiotic Dereplication Using the Antibiotic Resistance Platform
10:49

Antibiotic Dereplication Using the Antibiotic Resistance Platform

Published on: October 17, 2019

Antibiotic de-escalation.

Robert G Masterton1

  • 1Department of Microbiology, Ayrshire & Arran NHS Board, The Ayr Hospital, Dalmellington Road, Ayr KA6 6DX, UK. robert.masterton@aaaht.scot.nhs.uk

Critical Care Clinics
|December 15, 2010
PubMed
Summary
This summary is machine-generated.

Antibiotic de-escalation, stopping or narrowing antibiotics based on results, is clinically effective for sepsis. Further research is needed to optimize its implementation and fully understand its benefits in antimicrobial stewardship.

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Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations
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Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
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Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses

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Related Experiment Videos

Last Updated: Jun 6, 2026

Antibiotic Dereplication Using the Antibiotic Resistance Platform
10:49

Antibiotic Dereplication Using the Antibiotic Resistance Platform

Published on: October 17, 2019

Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations
11:15

Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations

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Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
11:17

Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses

Published on: August 30, 2018

Area of Science:

  • Infectious Diseases
  • Clinical Pharmacy
  • Microbiology

Background:

  • Antibiotic de-escalation is crucial for effective sepsis treatment and combating antimicrobial resistance.
  • It involves adjusting antibiotic therapy based on microbiological data, typically around day 3.
  • De-escalation is a core component of antimicrobial stewardship programs.

Purpose of the Study:

  • To evaluate the clinical effectiveness and appropriateness of antibiotic de-escalation.
  • To highlight the need for further research into optimizing de-escalation strategies and benefits.

Main Methods:

  • Review of data demonstrating the clinical efficacy of antibiotic de-escalation.
  • Analysis of the role of microbiology results in guiding de-escalation decisions.

Main Results:

  • Antibiotic de-escalation was found to be clinically effective and appropriate.
  • Current data support the use of de-escalation in managing serious sepsis.

Conclusions:

  • Antibiotic de-escalation should be integrated into routine antimicrobial management.
  • Further studies are required to identify optimal implementation tools and fully elucidate the benefits of de-escalation.