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Related Concept Videos

Antifungal Agents01:15

Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
Antiprotozoal Agents01:21

Antiprotozoal Agents

Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
Candidiasis01:20

Candidiasis

Candidiasis is a fungal infection caused by opportunistic species of Candida. It can affect various anatomical sites, including the skin, oral cavity, nails, and genitourinary tract. Among its forms, vaginal candidiasis is the most common type of mucosal infection. It typically results from the overgrowth of Candida albicans in the vaginal mucosa. Under normal conditions, C. albicans exists as a commensal organism within the vaginal microbiota, regulated by the dominance of lactobacilli, which...
Fungal Group Zygomycota01:29

Fungal Group Zygomycota

Zygomycota, previously classified as a distinct fungal group, are primarily terrestrial, saprophytic molds that play a crucial role as decomposers. Recent phylogenetic studies have revealed that these fungi are now divided into two major clades — Mucoromycota, which includes many symbiotic species, and Zoopagomycota, which primarily consists of parasitic and pathogenic fungi. These groups exhibit distinct ecological roles and reproductive strategies while sharing key structural and...
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Cryptococcal Meningitis01:27

Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...

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Whole Genome Sequencing of Candida glabrata for Detection of Markers of Antifungal Drug Resistance
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Whole Genome Sequencing of Candida glabrata for Detection of Markers of Antifungal Drug Resistance

Published on: December 28, 2017

Update on azole antifungals.

Dimitrios I Zonios1, John E Bennett

  • 1Clinical Mycology Section, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA.

Seminars in Respiratory and Critical Care Medicine
|March 28, 2008
PubMed
Summary
This summary is machine-generated.

This review compares four triazole antifungals: fluconazole, itraconazole, voriconazole, and posaconazole. Each offers unique benefits and drawbacks for treating fungal infections, influencing clinical use decisions.

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Area of Science:

  • Medical Mycology
  • Pharmacology
  • Infectious Diseases

Background:

  • Triazoles are crucial antifungal agents.
  • Four agents are commercially available: fluconazole, itraconazole, voriconazole, and posaconazole.
  • Understanding their pharmacology, interactions, and clinical utility is vital.

Purpose of the Study:

  • To provide a comprehensive clinical review of the four major triazole antifungals.
  • To summarize their pharmacology, drug interactions, adverse events, and antifungal activity.
  • To discuss evolving clinical perspectives and key trial data.

Main Methods:

  • Literature review of clinical trials and pharmacological data.
  • Comparative analysis of fluconazole, itraconazole, voriconazole, and posaconazole.
  • Summary of drug indications, safety profiles, and pharmacokinetic properties.

Main Results:

  • Fluconazole is a cost-effective option for candidiasis and cryptococcosis, lacking activity against filamentous fungi.
  • Itraconazole has broad activity but suffers from bioavailability issues and numerous drug interactions.
  • Voriconazole is effective for aspergillosis but has complex pharmacokinetics and adverse events.
  • Posaconazole offers an extended spectrum, including zygomycetes, with a good safety profile, useful for prophylaxis.

Conclusions:

  • Each triazole antifungal has a distinct profile, guiding selection for specific fungal infections and patient populations.
  • Voriconazole and posaconazole represent significant advancements, particularly for immunocompromised patients.
  • Careful consideration of pharmacology, interactions, and adverse events is necessary for optimal triazole therapy.