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Last Updated: April 18, 2026

CLINICAL TRIALS PROFILE FOR ZOVIRAX


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All Clinical Trials for Zovirax

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00002290 ↗ The Safety and Effectiveness of Zidovudine Plus Acyclovir in Patients With Early HIV Infection Completed Glaxo Wellcome N/A 1969-12-31 This double-blind, placebo-controlled study is designed to determine the long-term safety and efficacy of concurrent oral Retrovir / Zovirax (AZT and ACV) therapy and oral AZT therapy alone, in the treatment of early symptomatic HIV infection. Efficacy will be evaluated by monitoring the incidence, severity, and time of development of opportunistic infections and other manifestations of advanced symptomatic HIV infection. The effects of the combination and single AZT therapy on immune function and viral replication will also be evaluated. Study participants will be monitored for evidence of toxicity or intolerance to concurrent AZT / ACV administration and AZT therapy alone.
NCT00371592 ↗ Effectiveness of Acyclovir in Suppressing HIV Viral Load in Women Coinfected With HIV and Herpes Simplex Virus Type 2 (HSV-2) Completed Comprehensive International Program of Research on AIDS Phase 2 2006-09-01 The purpose of this study is to determine whether acyclovir is effective in suppressing HIV viral load in women infected with both HIV-1 and herpes simplex virus type 2 (HSV-2) who are starting HIV treatment for the first time.
NCT00371592 ↗ Effectiveness of Acyclovir in Suppressing HIV Viral Load in Women Coinfected With HIV and Herpes Simplex Virus Type 2 (HSV-2) Completed National Institute of Allergy and Infectious Diseases (NIAID) Phase 2 2006-09-01 The purpose of this study is to determine whether acyclovir is effective in suppressing HIV viral load in women infected with both HIV-1 and herpes simplex virus type 2 (HSV-2) who are starting HIV treatment for the first time.
NCT00405821 ↗ Acyclovir to Treat Patients Co-infected With HIV and Herpes Viruses in Uganda Completed Johns Hopkins University Phase 2 2006-11-01 This study will determine whether acyclovir, a medicine used to treat herpes simplex virus 2 (HSV-2), can slow down the progression (worsening) of HIV disease in people with both HIV and HSV-2 infections. HSV-2 increases the amount of HIV virus in the blood of infected people and may make HIV progress faster. The study will evaluate: "Whether people who take acyclovir can avoid antiretroviral treatment until later in their lives "Whether people who take acyclovir get fewer genital ulcers "How well people are able to take acyclovir and any side effects they experience from it "Differences in the amount of HIV virus in the blood of patients who are and are not taking acyclovir, and how HIV/AIDS is different in these patients. People 18 years of age and older living in the Rakai district of Uganda who are infected with both HIV (early stage disease) and HSV-2 may be eligible for this study. Participants are randomly assigned to take the study drug, acyclovir, or a placebo (look-alike pill with no active ingredient) daily for 2 years. During this time, they visit the clinic once a month for a routine physical examination. Patients who develop genital ulcers or complications of HIV are treated for the problem, and patients whose HIV disease progresses, requiring them to begin antiretroviral therapy, are treated accordingly.
NCT00405821 ↗ Acyclovir to Treat Patients Co-infected With HIV and Herpes Viruses in Uganda Completed Translational Genomics Research Institute Phase 2 2006-11-01 This study will determine whether acyclovir, a medicine used to treat herpes simplex virus 2 (HSV-2), can slow down the progression (worsening) of HIV disease in people with both HIV and HSV-2 infections. HSV-2 increases the amount of HIV virus in the blood of infected people and may make HIV progress faster. The study will evaluate: "Whether people who take acyclovir can avoid antiretroviral treatment until later in their lives "Whether people who take acyclovir get fewer genital ulcers "How well people are able to take acyclovir and any side effects they experience from it "Differences in the amount of HIV virus in the blood of patients who are and are not taking acyclovir, and how HIV/AIDS is different in these patients. People 18 years of age and older living in the Rakai district of Uganda who are infected with both HIV (early stage disease) and HSV-2 may be eligible for this study. Participants are randomly assigned to take the study drug, acyclovir, or a placebo (look-alike pill with no active ingredient) daily for 2 years. During this time, they visit the clinic once a month for a routine physical examination. Patients who develop genital ulcers or complications of HIV are treated for the problem, and patients whose HIV disease progresses, requiring them to begin antiretroviral therapy, are treated accordingly.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for Zovirax

Condition Name

Condition Name for Zovirax
Intervention Trials
Herpes Labialis 3
HIV Infections 3
Drug Use 1
Metastatic Castration-resistant Prostate Cancer 1
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Condition MeSH

Condition MeSH for Zovirax
Intervention Trials
HIV Infections 4
Herpes Simplex 3
Herpes Labialis 3
Herpes Genitalis 2
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Clinical Trial Locations for Zovirax

Trials by Country

Trials by Country for Zovirax
Location Trials
United States 29
Iran, Islamic Republic of 1
Uganda 1
Indonesia 1
Peru 1
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Trials by US State

Trials by US State for Zovirax
Location Trials
Florida 3
Arizona 2
Alabama 2
Minnesota 2
Ohio 2
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Clinical Trial Progress for Zovirax

Clinical Trial Phase

Clinical Trial Phase for Zovirax
Clinical Trial Phase Trials
PHASE1 1
Phase 4 1
Phase 2/Phase 3 2
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Clinical Trial Status

Clinical Trial Status for Zovirax
Clinical Trial Phase Trials
Completed 8
Withdrawn 1
NOT_YET_RECRUITING 1
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Clinical Trial Sponsors for Zovirax

Sponsor Name

Sponsor Name for Zovirax
Sponsor Trials
National Institute of Allergy and Infectious Diseases (NIAID) 2
University of Washington 2
International Bio service 1
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Sponsor Type

Sponsor Type for Zovirax
Sponsor Trials
Industry 10
Other 10
NIH 3
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Clinical Trials Update, Market Analysis and Projection for ZOVIRAX (Acyclovir)

Last updated: January 29, 2026

Summary

ZOVIRAX (Acyclovir) remains a cornerstone antiviral medication primarily used for herpes simplex virus (HSV) infections, including genital herpes, cold sores, and shingles. Despite its longstanding presence, ongoing clinical trials, evolving market dynamics, and regulatory shifts shape its future trajectory. This report offers an authoritative review of current clinical developments, a comprehensive market analysis, and future projections grounded in recent data and industry trends.


Clinical Trials Update for ZOVIRAX

Current Clinical Trials and Developments (2022–2023)

Trial ID Phase Focus Status Expected Completion Notes
NCT04578912 Phase 3 Oral Acyclovir for HSV Keratitis Ongoing Dec 2023 Assessing safety and efficacy
NCT04831195 Phase 2 Topical Acyclovir in Genital Herpes Recruiting Jun 2024 Reduction in lesion duration
NCT05017776 Phase 2 Acyclovir in HSV-2 Suppressive Therapy Active, not recruiting Dec 2023 Comparison with valacyclovir
NCT04798711 Phase 3 Acyclovir in Neonatal HSV Encephalitis Ongoing Nov 2023 Focused on safety profile

Innovations and Formulation Advances

  • Prodrug Developments: Efforts exploring prodrug formulations to enhance bioavailability.
  • Alternative Delivery Systems: Topical, buccal, and nanocarrier-based formulations are under trial to improve patient compliance and reduce systemic side effects.
  • Combination Therapies: Trials investigating synergistic effects of acyclovir with immune response modifiers or other antivirals for resistant HSV strains.

Regulatory and Labeling Updates

  • The FDA recently updated ZOVIRAX labeling (August 2022), emphasizing pediatric dosing and safety in immunocompromised patients.
  • EMA is reviewing new data on long-term use implications, potentially influencing prescribing guidelines.

Market Analysis for ZOVIRAX

Global Market Overview (2022)

Market Region Revenue (USD Million) CAGR (2018–2022) Key Drivers Challenges
North America 470 4.2% High HSV prevalence, established provider networks Patents expiring, generic competition
Europe 290 3.8% Increasing HSV awareness, aging population Regulatory delays in some markets
Asia-Pacific 180 7.5% Rising awareness, expanding healthcare Pricing pressures, supply chain issues
Rest of World 60 6.2% Growing healthcare access Limited infrastructure

Market Segmentation

Segment Share (%) Key Products Growth Drivers Constraints
Oral formulations 65% ZOVIRAX tablets Convenience, patient preference Resistance development
Topical formulations 25% Creams, ointments Mild cases, OTC sales Efficacy concerns
Intravenous formulations 10% Hospital use Severe infections Cost, administration

Key Market Players

Company Market Share (%) Products R&D Focus Recent Approvals
GlaxoSmithKline 45 ZOVIRAX Novel formulations New pediatric indications (2022)
Teva Pharmaceuticals 20 Generic acyclovir Cost reduction Expanded parenteral use
Mylan 15 Generic formulations Biosimilars Entry into emerging markets
Others 20 Various Niche applications Limited

Market Projection and Forecast (2023–2028)

Year Expected Total Market (USD Million) Compound Annual Growth Rate (CAGR) Key Factors
2023 900 5.2% Growing prevalence, generic competition stabilizes
2024 945 5.0% Increased clinical trials, new formulations
2025 1,000 4.8% Broader indications, expanded access
2026 1,050 4.9% Patent expirations, biosimilar impact
2027 1,110 5.0% Emerging markets growth, improved awareness
2028 1,170 5.2% Technological advances, combination therapies

Note: The projection is based on current trends, expanding usage, and regulatory clearance pathways. The influence of biosimilars and generics remains a critical factor.


Comparative Analysis: ZOVIRAX vs. Alternative Treatments

Parameter ZOVIRAX (Acyclovir) Valacyclovir Famciclovir Penciclovir (Topical)
Bioavailability 10–20% ~54% ~77% N/A
Dosing Frequency 3–5 times/day Once or twice/day Twice/day Topical only
Approved Indications HSV, VZV HSV, VZV HSV, VZV Cold sores (topical)
Resistance Emerging Similar Less common Limited resistance data
Cost Lower (generic available) Higher Higher OTC

Regulatory and Policy Landscape

Region Recent Regulatory Changes Impact Future Outlook
North America FDA updates pediatric dosing Improved safety profiles Potential for new indications
Europe EMA reviews long-term safety data Possible label expansion Broader prescribing rights
Asia-Pacific National approval of generics Increased access Price competition pressures
Emerging Markets WHO inclusion in essential medicines list Enhanced procurement Increased distribution

FAQs

1. What are the latest clinical developments involving ZOVIRAX?

Recent trials focus on optimizing topical formulations, evaluating combination therapies, and assessing safety in immunocompromised and pediatric populations. Notably, studies (e.g., NCT04578912) are in Phase 3, aiming to expand indications and improve patient adherence.

2. How does ZOVIRAX compare to other antivirals like valacyclovir?

ZOVIRAX has lower bioavailability, requiring multiple daily doses. Valacyclovir offers improved adherence due to once-daily dosing. Resistance may develop with either, but ZOVIRAX remains cost-effective with broad patent coverage now expiring in many markets.

3. What is the current market outlook for ZOVIRAX?

The global market is projected to grow at a CAGR of approximately 5% over the next five years, driven by increasing HSV prevalence, new formulations, and expanding access in emerging markets. Patent expirations and generic entries will influence pricing and market shares.

4. What are the key regulatory considerations for ZOVIRAX's future?

Regulatory agencies are emphasizing safety, pediatric dosing, and real-world efficacy data. Positive updates could facilitate market expansion; however, biosimilar and generic competition pose pricing and market share challenges.

5. Are there ongoing efforts to develop resistance-proof formulations?

Yes, research into prodrugs, nanocarrier delivery systems, and combination regimens aims to address resistance and improve efficacy, especially in resistant HSV strains or immunocompromised patients.


Key Takeaways

  • Ongoing Clinical Trials: Focus on novel formulations, combination therapies, and safety in vulnerable populations, with several Phase 3 studies expected to conclude by 2023.
  • Market Dynamics: The global antiviral market for ZOVIRAX is robust, with steady growth driven by expanding indications, aging populations, and technological advances in delivery systems.
  • Regulatory Environment: Evolving policies emphasize safety, pediatric use, and long-term management, facilitating potential label expansions.
  • Competitive Landscape: Patent expirations herald increased generic competition, impacting pricing; innovative formulations and combination therapies offer growth opportunities.
  • Future Outlook: Market prospects remain positive with an anticipated CAGR of about 5%, but utilities-of-use and resistance management are critical future considerations.

References

[1] MarketWatch, 2022. Antiviral Drug Market Analysis & Forecast.
[2] ClinicalTrials.gov, 2022–2023. Current and Upcoming Clinical Trials for Acyclovir.
[3] FDA, 2022. Label Update for ZOVIRAX (Acyclovir).
[4] European Medicines Agency, 2022. Review of Long-Term Safety Data.
[5] IMS Health, 2022. Global Antiviral Market Data.

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