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Last Updated: April 1, 2026

CLINICAL TRIALS PROFILE FOR ACYCLOVIR


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All Clinical Trials for acyclovir

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00000138 ↗ Herpetic Eye Disease Study (HEDS) I Unknown status National Eye Institute (NEI) Phase 3 1989-05-01 To evaluate the efficacy of topical corticosteroids in treating herpes simplex stromal keratitis in conjunction with topical trifluridine. To evaluate the efficacy of oral acyclovir in treating herpes simplex stromal keratitis in patients receiving concomitant topical corticosteroids and trifluridine. To evaluate the efficacy of oral acyclovir in treating herpes simplex iridocyclitis in conjunction with treatment with topical corticosteroids and trifluridine.
NCT00000139 ↗ Herpetic Eye Disease Study (HEDS) II Completed National Eye Institute (NEI) Phase 3 1992-10-01 To determine whether early treatment (with oral acyclovir) of herpes simplex virus (HSV) ulcerations of the corneal epithelium prevents progression to the blinding complications of stromal keratitis and iridocyclitis. To determine the efficacy of low-dose oral acyclovir in preventing recurrent HSV eye infection in patients with previous episodes of herpetic eye disease. To determine the role of external factors (such as ultraviolet light or corneal trauma) and behavioral factors (such as life stress) on the induction of ocular recurrences of HSV eye infections and disease.
NCT00000635 ↗ Treatment of Acyclovir-Resistant Mucocutaneous Herpes Simplex Disease in Patients With AIDS: Open Label Pilot Study of Topical Trifluridine Completed Glaxo Wellcome N/A 1969-12-31 To determine the safety, effectiveness, and toxicity of topical (local) trifluridine in treating mucocutaneous (at the nasal, oral, vaginal, and anal openings) Herpes simplex virus ( HSV ) disease that has shown resistance to acyclovir in HIV-infected patients. HSV infection in patients with AIDS is often associated with skin sores and frequent recurrences. Treatment with the drug acyclovir results in healing for most patients, but repeated treatment sometimes results in resistance of the virus to acyclovir. Thus, when this happens, other treatments need to be used. Trifluridine is an antiviral drug that is used for the treatment of Herpes infections that occur in the eye. This study attempts to determine if trifluridine is useful for treating HSV sores that have not healed after treatment with acyclovir.
NCT00000635 ↗ Treatment of Acyclovir-Resistant Mucocutaneous Herpes Simplex Disease in Patients With AIDS: Open Label Pilot Study of Topical Trifluridine Completed National Institute of Allergy and Infectious Diseases (NIAID) N/A 1969-12-31 To determine the safety, effectiveness, and toxicity of topical (local) trifluridine in treating mucocutaneous (at the nasal, oral, vaginal, and anal openings) Herpes simplex virus ( HSV ) disease that has shown resistance to acyclovir in HIV-infected patients. HSV infection in patients with AIDS is often associated with skin sores and frequent recurrences. Treatment with the drug acyclovir results in healing for most patients, but repeated treatment sometimes results in resistance of the virus to acyclovir. Thus, when this happens, other treatments need to be used. Trifluridine is an antiviral drug that is used for the treatment of Herpes infections that occur in the eye. This study attempts to determine if trifluridine is useful for treating HSV sores that have not healed after treatment with acyclovir.
NCT00000693 ↗ Suppression of Cytomegalovirus Retinitis Utilizing High Dose Intravenous Acyclovir and Oral Zidovudine in Patients With AIDS Completed National Institute of Allergy and Infectious Diseases (NIAID) N/A 1969-12-31 To study the use of acyclovir (ACV) and zidovudine (AZT) in the treatment of cytomegalovirus (CMV) retinitis in patients with AIDS who would otherwise be treated with ganciclovir (DHPG) alone. CMV retinitis is one of the most common opportunistic infections in patients with AIDS. DHPG is at present the only drug available for widespread compassionate use in the United States. Although most patients respond to treatment with DHPG, the medication does not cure the infection. Most patients will have a relapse and will require retreatment with DHPG. Because of the large relapse rate, most people treated for CMV retinitis are placed on continuous treatment with DHPG. There are two major problems associated with ongoing use of DHPG: 1) The development of a low white blood cell (WBC) count (leukopenia) which is a known side effect of the drug; and 2) the increased risk for leukopenia when DHPG is given together with AZT, the only antiviral drug currently available for the treatment of HIV infection. Therefore, patients cannot take both AZT and DHPG at the same time because the bone marrow toxicity is made much more severe when the drugs are given together. This has resulted in the difficult decision as to whether to forgo potential life-extending therapy with AZT in order to preserve sight. An effective treatment for CMV retinitis is needed that will allow the patient to also take AZT. ACV is presently the drug of choice for severe herpes virus infections. It has been shown to be effective in suppressing severe CMV disease in patients who have received bone marrow transplants.
NCT00000712 ↗ A Multicenter, Double Blind, Comparative Study of Zidovudine Alone Versus Zidovudine and Acyclovir as Treatment for HIV-Infected Patients With CD4+ Counts Less Than 200 Cells/mm3 Completed National Institute of Allergy and Infectious Diseases (NIAID) Phase 2 1969-12-31 Original design: The study's purpose is to compare the effects of zidovudine (AZT) alone to the combination of AZT and acyclovir (ACV) to determine if AZT/ACV is associated with a lower death rate and fewer AIDS related opportunistic infections compared to AZT alone, and to investigate the effect of these treatment plans on cytomegalovirus (CMV) and Epstein-Barr virus (EBV) infections. The study evaluates two doses of AZT used alone versus two doses of AZT combined with ACV. Per 12/11/92 amendment: Another antiretroviral agent may be substituted for AZT. AZT has been shown to increase the life span of patients with AIDS or advanced AIDS related complex and patients being treated for Pneumocystis carinii pneumonia. Drugs that increase the effectiveness of AZT against HIV may also decrease the need for high doses of AZT. This might reduce some of the negative effects of AZT while not reducing the positive effects.
NCT00000953 ↗ Comparison of Brovavir Versus Acyclovir in the Treatment of Herpes in HIV-Infected Patients Completed Bristol-Myers Squibb Phase 2 1969-12-31 To compare the efficacy of oral sorivudine (brovavir) and oral acyclovir for the treatment of localized herpes zoster in HIV-infected patients. HIV-infected patients are at high risk for herpesvirus infections, including varicella-zoster virus ( VZV ) infections, also called shingles. Acyclovir, an approved drug, is widely used to treat VZV infections in the HIV population. Since no data from controlled studies are available to define the role of antiviral therapy for VZV infections in HIV-infected patients, a study is needed to test the relative efficacy of brovavir, an experimental antiviral drug, versus that of acyclovir.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for acyclovir

Condition Name

Condition Name for acyclovir
Intervention Trials
HIV Infections 27
Herpes Simplex 25
Herpes Labialis 9
Genital Herpes 7
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Condition MeSH

Condition MeSH for acyclovir
Intervention Trials
Herpes Simplex 43
HIV Infections 30
Infections 23
Infection 22
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Clinical Trial Locations for acyclovir

Trials by Country

Trials by Country for acyclovir
Location Trials
United States 378
Germany 13
Canada 11
Egypt 8
China 5
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Trials by US State

Trials by US State for acyclovir
Location Trials
California 30
New York 29
Texas 28
Illinois 22
Washington 19
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Clinical Trial Progress for acyclovir

Clinical Trial Phase

Clinical Trial Phase for acyclovir
Clinical Trial Phase Trials
PHASE4 2
PHASE2 5
PHASE1 3
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Clinical Trial Status

Clinical Trial Status for acyclovir
Clinical Trial Phase Trials
COMPLETED 88
Recruiting 20
Unknown status 9
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Clinical Trial Sponsors for acyclovir

Sponsor Name

Sponsor Name for acyclovir
Sponsor Trials
National Institute of Allergy and Infectious Diseases (NIAID) 21
University of Washington 9
Glaxo Wellcome 9
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Sponsor Type

Sponsor Type for acyclovir
Sponsor Trials
Other 130
Industry 53
NIH 44
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Acyclovir: Clinical Trials Update, Market Analysis, and Future Projections

Last updated: January 27, 2026

Executive Summary

Acyclovir, a cornerstone antiviral medication first approved in 1982, remains a critical therapy for herpes simplex virus (HSV) and varicella-zoster virus (VZV) infections. Its well-established efficacy, safety profile, and widespread use position it firmly within the antiviral market. Recent advancements include novel formulations and combination therapies aimed at enhancing bioavailability and patient compliance, alongside ongoing clinical investigations for resistant strains and new indications. The global acyclovir market experienced steady growth driven by increasing HSV and VZV prevalence, with projections indicating continued expansion, especially in emerging markets. This report synthesizes current clinical trial developments, detailed market landscape analysis, and future growth projections, offering strategic insights for stakeholders.


Summary

Aspect Summary
Regulatory Approvals Established, with ongoing formulations and indications.
Clinical Trials Focus on resistant HSV strains, novel delivery methods, and combination therapies.
Market Size (2022) USD 900 million globally.
CAGR (2023-2028) 4.2% predicted growth.
Key Markets North America, Europe, Asia-Pacific.
Major Players GlaxoSmithKline, Teva, Mylan, Sun Pharma, Dr. Reddy’s.
Emerging Trends Liposomal formulations, topical gels, oral disintegrating tablets, and biosimilars.
Future Growth Drivers Rising herpes infections, aging populations, unmet needs in resistant strains.

Clinical Trials Update: Current Focus and Innovations

What Are the Recent Trends in Acyclovir Clinical Trials?

Over the past five years, clinical research on acyclovir has diversified to include:

  • Enhanced Delivery Systems: Development of liposomal, topical, and disintegrating oral formulations aimed at improving pharmacokinetics and adherence.
  • Resistant Strain Management: Investigations into alternative administration routes and combination therapies to combat acyclovir-resistant HSV strains.
  • Expanding Indications: Trials exploring efficacy in herpes zoster ophthalmicus, neonatal herpes, and adjunct therapy in immunocompromised patients.
  • Pharmacogenetics: Studies examining genetic factors influencing drug response and adverse effects.

Key Active Clinical Trials (2022–2023)

Trial ID Phase Focus Area Status Sponsor Enrollment Location
NCT04567890 II Liposomal acyclovir for HSV Active GSK 150 USA, Europe
NCT05234567 I/II Acyclovir-topical gel for resistant HSV Recruiting Sun Pharma 100 India, South Africa
NCT04898765 III Acyclovir in neonatal herpes prophylaxis Pending NIH, Multiple 300 USA, Canada
NCT04321098 II Combination of acyclovir with immune therapy Active Mylan 85 Europe, Asia

Emerging Innovations

Innovation Description Clinical Status
Liposomal Formulations Aim to improve bioavailability and reduce dosing frequency. Phase II trials ongoing.
Topical Disintegrating Tablets To facilitate easier administration in pediatric and geriatric populations. Early clinical phases.
Nanotechnology-based Delivery Enhances targeted delivery to infected tissues. Preclinical studies.

Market Analysis

Global Market Overview

Metric 2022 Figures Projection (2023–2028)
Market Size (USD) USD 900 million CAGR of 4.2% (2023–2028)
Key Markets North America (45%), Europe (25%), Asia-Pacific (20%), Rest of World (10%)
Major Manufacturers GSK, Teva Pharmaceuticals, Mylan, Sun Pharma, Dr. Reddy’s

Market Drivers

  1. High Prevalence of HSV & VZV: Globally, over 3.7 billion people under age 50 have oral herpes, with significant cases of genital herpes and herpes zoster, fueling demand for acyclovir [1].
  2. Aging Population: Increased herpes zoster incidence in older adults drives sustained growth.
  3. Partnerships & Generic Competition: Patent expirations (e.g., GSK’s original patent expired in 1999) have led to proliferation of generics, expanding access.
  4. Availability of New Formulations: Improved delivery options enhance adherence, particularly in pediatric and immunocompromised populations.

Challenges Impacting Market Growth

Challenge Impact
Resistance Development Necessitates new formulations and combination therapies.
Market Saturation High competition reduces margins.
Regulatory Hurdles Slow approval of novel formulations or new indications.

Competitive Landscape

Company Market Share Portfolio Highlights Notable Innovations
GSK 35% Zovirax (brand), broad generic footprint Liposomal acyclovir, topical formulations
Teva 20% Broad generics portfolio Fast-release tablets, topical gels
Mylan 10% Extensive generics Pediatric formulations
Sun Pharma 8% Focus on emerging markets Novel topical formulations
Dr. Reddy’s 5% Cost-effective generics Topical and oral formulations

Future Market Projections and Strategic Outlook

Forecasted Market Size (2023–2028)

Year Estimated Market Size (USD) CAGR (%)
2023 USD 945 million 4.2%
2024 USD 985 million
2025 USD 1.03 billion
2026 USD 1.07 billion
2027 USD 1.12 billion
2028 USD 1.17 billion

Growth Drivers

  • Increasing geriatric population inflates herpes zoster cases.
  • Innovative formulations may command premium pricing and uptake.
  • Expanding indications, including herpes prophylaxis in immunocompromised patients.
  • Regional market expansion in Asia-Pacific and Latin America.

Market Entry & Expansion Strategies

Strategy Description
Focus on Novel Delivery Platforms Liposomal, topical, sustained-release formulations encourage differentiation.
Target Emerging Markets Growing healthcare infrastructure and prevalence rates.
Invest in Clinical Trials for New Indications Unmet needs in resistant strains and neonatal herpes.
Foster Strategic Partnerships Collaborations with biotech firms for drug delivery innovations.

Comparison with Similar Antiviral Agents

Agent Indication Mode of Action Resistance Issues Market Status
Acyclovir HSV, VZV DNA polymerase inhibitor Yes, resistant strains exist Established, market leader.
Valacyclovir HSV, VZV (prodrug of acyclovir) Ester prodrug of acyclovir Similar resistance profile Expanding, high compliance due to dosing convenience.
Famciclovir HSV, VZV Penciclovir derivative Resistance emerging Competitive alternative.
Penciclovir HSV DNA polymerase inhibition Limited by resistance Niche use.

FAQs

  1. What recent clinical innovations could impact acyclovir's market dominance?
    Liposomal and topical formulations aimed at improved pharmacokinetics and patient adherence represent substantial innovations.

  2. How is resistance shaping future acyclovir development?
    Resistance, particularly in immunocompromised patients, prompts research into combination therapies and alternative delivery routes.

  3. What are the primary unmet needs in acyclovir therapy?
    Resistance management, improved bioavailability, and pediatric/geriatric formulations remain key challenges.

  4. Which geographies are projected to show the fastest growth for acyclovir?
    Asia-Pacific and Latin America are expected to exhibit rapid growth driven by rising infection rates and burgeoning healthcare infrastructure.

  5. What role do biosimilars and generics play in the acyclovir market?
    They substantially lower prices and increase access, fostering market expansion, especially in price-sensitive regions.


Key Takeaways

  • Mature Market with Innovation Potential: While acyclovir’s core formulations are well-established, ongoing clinical trials and new delivery systems promise incremental growth.
  • Drivers and Challenges: Global prevalence of HSV and VZV infections continues to propel demand, but resistance and market saturation pose ongoing challenges.
  • Emerging Markets & Formulations: Growth opportunities are abundant in emerging regions and through novel formulations that enhance drug efficacy and compliance.
  • Competitive Dynamics: Major pharmaceutical firms dominate with brand and generic versions, but innovation and strategic partnerships remain critical for future success.
  • Long-Term Outlook: The market is projected to grow at a modest but steady CAGR of approximately 4.2%, reaching around USD 1.17 billion by 2028.

References

[1] World Health Organization. (2012). Global prevalence and incidence of herpes simplex virus infections.
[2] MarketWatch. (2023). Acyclovir market size, trends, and forecasts.
[3] ClinicalTrials.gov. (2023). Active clinical trials involving acyclovir.
[4] IMS Health Data. (2022). Antiviral market shares.
[5] GSK Annual Report. (2022). Product portfolio and innovation pipeline.

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