Antiviral drugs
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Overview of Antiviral Drugs: Types and Target Viruses
Antiviral drugs are medicines designed to treat infections caused by viruses. Over the past decades, a wide range of antiviral drugs have been developed and approved for use against major viral diseases such as HIV, hepatitis B and C, herpesviruses, influenza, and others. These drugs are usually specific to certain viruses or virus families, and most act by inhibiting key steps in the viral life cycle, such as entry, replication, or assembly Oxford2020Clercq2001De Clercq2004+4 MORE.
Mechanisms of Action of Antiviral Drugs
Antiviral drugs work by targeting either the virus directly or the host cell factors that the virus needs to replicate. Common mechanisms include:
- Inhibiting viral entry into host cells (entry inhibitors)
- Blocking viral uncoating (uncoating inhibitors)
- Inhibiting viral genome replication (polymerase inhibitors, reverse transcriptase inhibitors)
- Blocking viral protein processing (protease inhibitors)
- Preventing integration of viral DNA into the host genome (integrase inhibitors)
- Modulating the immune response (interferons, immunomodulators) Oxford2020De Clercq2016Kausar2021+1 MORE.
Some drugs, like nucleoside and nucleotide analogues, act as false building blocks for viral DNA or RNA, stopping the virus from making new genetic material. Others, such as neuraminidase inhibitors, block the release of new influenza virus particles from infected cells Clercq2001De Clercq2004De Clercq2016+2 MORE.
Major Classes and Examples of Antiviral Drugs
HIV Antiviral Drugs
HIV treatment uses a combination of drugs from different classes to prevent resistance and suppress the virus. These include:
- Nucleoside/nucleotide reverse transcriptase inhibitors (NRTIs/NtRTIs): zidovudine, lamivudine, tenofovir
- Non-nucleoside reverse transcriptase inhibitors (NNRTIs): nevirapine, efavirenz
- Protease inhibitors: ritonavir, lopinavir
- Integrase inhibitors: raltegravir
- Entry inhibitors: enfuvirtide Clercq2001De Clercq2004De Clercq2016+1 MORE.
Hepatitis B and C Antiviral Drugs
For hepatitis B, drugs include nucleoside analogues (lamivudine, entecavir) and interferons. Hepatitis C treatment has evolved to use direct-acting antivirals (DAAs) that target viral protease, polymerase, or other proteins, often in combination for better results Oxford2020Clercq2001De Clercq2004+3 MORE.
Herpesvirus Antiviral Drugs
Herpesvirus infections (including herpes simplex, varicella-zoster, and cytomegalovirus) are treated with drugs like acyclovir, valacyclovir, ganciclovir, and foscarnet, which inhibit viral DNA polymerase Clercq2001De Clercq2004De Clercq2016+2 MORE.
Influenza Antiviral Drugs
Influenza is treated with neuraminidase inhibitors (oseltamivir, zanamivir) and, less commonly now due to resistance, M2 ion channel inhibitors (amantadine, rimantadine) Oxford2020Clercq2001De Clercq2004+3 MORE.
Other Antiviral Drugs
Ribavirin is used for respiratory syncytial virus (RSV) and sometimes for hepatitis C. Some drugs, like cidofovir, have activity against multiple DNA viruses De Clercq2016Razonable2011.
Challenges: Drug Resistance and Emerging Viruses
A major challenge in antiviral therapy is the development of drug resistance, especially with long-term use or monotherapy. Viruses can mutate, making drugs less effective. This is why combination therapy is standard for HIV and hepatitis C, and why new drugs are continually being developed Oxford2020De Clercq2016Kausar2021+2 MORE.
Emerging viruses such as SARS-CoV, MERS-CoV, Zika, and Ebola highlight the need for broad-spectrum antivirals and rapid drug development strategies. Drug repurposing, targeting host cell functions, and new molecular technologies are being explored to address these threats Oxford2020Tompa2021Adamson2021+1 MORE.
Conclusion
Antiviral drugs have transformed the management of many viral infections, especially HIV, hepatitis, herpesviruses, and influenza. However, drug resistance and the emergence of new viruses remain significant challenges. Ongoing research focuses on developing new drugs, improving existing therapies, and preparing for future viral outbreaks with broad-spectrum and rapidly deployable antiviral agents Oxford2020De Clercq2016Tompa2021+2 MORE.
Sources and full results
Most relevant research papers on this topic
Antiviral drugs: current state of the art.
Antiviral drugs have advanced significantly, with 15 licensed for HIV treatment and others in development for hepatitis B, herpesvirus, cytomegalovirus, influenza, and respiratory syncytial virus infections.
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