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Antiviral Nucleoside Inhibitors

Antiviral Nucleoside Inhibitors

Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...

Drugs Used in Upper Respiratory Disorders: Overview

Drugs Used in Upper Respiratory Disorders: Overview

Upper respiratory tract disorders, including viral infections and allergic rhinitis, cause significant discomfort and disrupt daily life. Managing these conditions involves a variety of drugs, such as antihistamines, intranasal steroids, decongestants, antitussives, expectorants, and mucolytics. Specific examples of drugs in each category are provided.
Antihistamines (e.g., Benadryl) block histamines from binding. Histamines are chemicals released during an allergic reaction in the body. As a...

Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics

Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics

Respiratory symptoms, such as congestion and cough, commonly accompany respiratory tract conditions. Various medications, such as antitussives, expectorants, and mucolytics, play crucial roles in providing relief.
Antitussives include codeine, dextromethorphan (Robitussin), and benzonatate (Tessalon). Codeine and dextromethorphan exert their effects centrally by suppressing the cough reflex center in the medulla. Benzonatate operates peripherally within the respiratory tract by anesthetizing...

Inhibitors of Viral Protein Synthesis

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...

Upper Respiratory Drugs: Decongestants

Upper Respiratory Drugs: Decongestants

Decongestants are a class of medications used primarily to alleviate nasal congestion, a common symptom resulting from allergies, colds, sinusitis, and other upper respiratory tract infections. These drugs work by activating α-adrenergic receptors, constricting small blood vessels in the nasal membranes. This action results in the opening of clogged nasal passages, thereby facilitating sinus drainage and relieving congestion.
Most decongestants are readily available over-the-counter in various...

Inhibitors Of Virion Release

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...

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Related Experiment Video

Updated: Jul 13, 2026

Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

Published on: October 29, 2015

WITHDRAWN: Antivirals for the common cold.

T O Jefferson, D Tyrrell

The Cochrane Database of Systematic Reviews

|July 20, 2007

Summary

Experimental antivirals show promise for common cold prevention, with some like Pleconaril demonstrating high efficacy and good tolerability. However, interferons have safety concerns, and further research is needed for other promising compounds.

Area of Science:

Virology
Pharmacology
Epidemiology

Background:

The common cold is a widespread illness with ongoing research into preventive and treatment interventions.
Experimental antiviral development has advanced with increased understanding of the common cold.
This review synthesizes evidence on experimental antiviral compounds for common cold management.

Purpose of the Study:

To identify, assemble, and evaluate randomized controlled trials on antivirals for common cold prevention and treatment.
To synthesize findings from published and unpublished studies on antiviral efficacy.
To assess the impact of antivirals in minimizing common cold effects.

Main Methods:

Searched electronic databases, contacted researchers, and reviewed archives of the MRC's Common Cold Unit.

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High-throughput Screening for Broad-spectrum Chemical Inhibitors of RNA Viruses

High-throughput Screening for Broad-spectrum Chemical Inhibitors of RNA Viruses

Published on: May 5, 2014

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Last Updated: Jul 13, 2026

Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

Published on: October 29, 2015

High-throughput Screening for Broad-spectrum Chemical Inhibitors of RNA Viruses

High-throughput Screening for Broad-spectrum Chemical Inhibitors of RNA Viruses

Published on: May 5, 2014

Included original reports of randomized and quasi-randomized trials.

Assessed antivirals in both experimentally infected volunteers and community-exposed individuals.

Main Results:

Intranasal interferons show high preventive efficacy but have safety concerns, including nasal discharge.
Dipyridamole, ICI 130, 685, Impulsin (palmitate), and Pleconaril demonstrate significant antiviral properties and good tolerability.
Evidence for other compounds in treating experimental or natural colds is limited.

Conclusions:

Currently, no licensed effective antivirals exist for the common cold.
Interferons are not recommended for general use due to side effects.
Further research on dipyridamole, ICI 130, 685, Impulsin, and Pleconaril is warranted, focusing on non-specific compounds for future development.