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Last Updated: March 26, 2026

CLINICAL TRIALS PROFILE FOR RIMANTADINE HYDROCHLORIDE


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505(b)(2) Clinical Trials for rimantadine hydrochloride

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials
Trial Type Trial ID Title Status Sponsor Phase Start Date Summary
New Combination NCT01413490 ↗ Hepatitis C Rimantadine and Antiviral Combination Therapy Completed Cancer Research UK 2012-05-01 Hepatitis C virus is one of the leading causes of liver failure and liver cancer worldwide. Current treatment of hepatitis C infection is only successful in about half of those who are eligible. The current treatment aims to boost the host immune system but does not directly act on the virus. Many drugs are in various stages of development that target the virus directly - their specific mode of action is confirmed by showing the virus is forced to adapt in the presence of the drug. As with many viruses, treating with only one specific drug would quickly lead to the virus adapting and becoming resistant. We therefore need to find new combinations of directly acting drugs. Rimantadine has already been shown in the laboratory to target hepatitis C directly. We have designed this study to see if it happens in real life as well. If so, we could use rimantadine to help fight hepatitis c more effectively.
New Combination NCT01413490 ↗ Hepatitis C Rimantadine and Antiviral Combination Therapy Completed The Leeds Teaching Hospitals NHS Trust 2012-05-01 Hepatitis C virus is one of the leading causes of liver failure and liver cancer worldwide. Current treatment of hepatitis C infection is only successful in about half of those who are eligible. The current treatment aims to boost the host immune system but does not directly act on the virus. Many drugs are in various stages of development that target the virus directly - their specific mode of action is confirmed by showing the virus is forced to adapt in the presence of the drug. As with many viruses, treating with only one specific drug would quickly lead to the virus adapting and becoming resistant. We therefore need to find new combinations of directly acting drugs. Rimantadine has already been shown in the laboratory to target hepatitis C directly. We have designed this study to see if it happens in real life as well. If so, we could use rimantadine to help fight hepatitis c more effectively.
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for rimantadine hydrochloride

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00298233 ↗ High-Dose Versus Standard-Dose Oseltamivir to Treat Severe Influenza and Avian Influenza Completed University of Oxford Phase 2 2006-02-01 Influenza, also known as the flu, is a contagious respiratory illness caused by influenza viruses. The illness can range in severity, from mild to severe to even death, and it causes an estimated 500,000 to 1,000,000 deaths worldwide each year. In the last several years, there have been increasing numbers of human cases of avian influenza, or bird flu. This trend may pose a threat of a future pandemic--worldwide outbreak of disease--with an avian influenza virus that can easily spread from person to person. Oseltamivir is an antiviral medication that is used to treat people with uncomplicated human influenza, and it may be effective in treating people with either severe human influenza or avian influenza. The purpose of this international study is to compare standard-dose oseltamivir versus high-dose oseltamivir for treating people who are hospitalized with severe human influenza or avian influenza.
NCT00298233 ↗ High-Dose Versus Standard-Dose Oseltamivir to Treat Severe Influenza and Avian Influenza Completed Wellcome Trust Phase 2 2006-02-01 Influenza, also known as the flu, is a contagious respiratory illness caused by influenza viruses. The illness can range in severity, from mild to severe to even death, and it causes an estimated 500,000 to 1,000,000 deaths worldwide each year. In the last several years, there have been increasing numbers of human cases of avian influenza, or bird flu. This trend may pose a threat of a future pandemic--worldwide outbreak of disease--with an avian influenza virus that can easily spread from person to person. Oseltamivir is an antiviral medication that is used to treat people with uncomplicated human influenza, and it may be effective in treating people with either severe human influenza or avian influenza. The purpose of this international study is to compare standard-dose oseltamivir versus high-dose oseltamivir for treating people who are hospitalized with severe human influenza or avian influenza.
NCT00298233 ↗ High-Dose Versus Standard-Dose Oseltamivir to Treat Severe Influenza and Avian Influenza Completed World Health Organization Phase 2 2006-02-01 Influenza, also known as the flu, is a contagious respiratory illness caused by influenza viruses. The illness can range in severity, from mild to severe to even death, and it causes an estimated 500,000 to 1,000,000 deaths worldwide each year. In the last several years, there have been increasing numbers of human cases of avian influenza, or bird flu. This trend may pose a threat of a future pandemic--worldwide outbreak of disease--with an avian influenza virus that can easily spread from person to person. Oseltamivir is an antiviral medication that is used to treat people with uncomplicated human influenza, and it may be effective in treating people with either severe human influenza or avian influenza. The purpose of this international study is to compare standard-dose oseltamivir versus high-dose oseltamivir for treating people who are hospitalized with severe human influenza or avian influenza.
NCT00298233 ↗ High-Dose Versus Standard-Dose Oseltamivir to Treat Severe Influenza and Avian Influenza Completed National Institute of Allergy and Infectious Diseases (NIAID) Phase 2 2006-02-01 Influenza, also known as the flu, is a contagious respiratory illness caused by influenza viruses. The illness can range in severity, from mild to severe to even death, and it causes an estimated 500,000 to 1,000,000 deaths worldwide each year. In the last several years, there have been increasing numbers of human cases of avian influenza, or bird flu. This trend may pose a threat of a future pandemic--worldwide outbreak of disease--with an avian influenza virus that can easily spread from person to person. Oseltamivir is an antiviral medication that is used to treat people with uncomplicated human influenza, and it may be effective in treating people with either severe human influenza or avian influenza. The purpose of this international study is to compare standard-dose oseltamivir versus high-dose oseltamivir for treating people who are hospitalized with severe human influenza or avian influenza.
NCT00979667 ↗ A Clinical Trial Comparing Oseltamivir With Placebo And Zanamivir With Control As First Line Treatment For Human Swine Influenza Infection Terminated Food and Health Bureau, Hong Kong Phase 3 2009-10-01 To evaluate the efficacy of oseltamivir ,as compared with the placebo arm and zanamivir with its control arm with respect to symptoms duration among patients infected with influenza A (H1N1) virus.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for rimantadine hydrochloride

Condition Name

Condition Name for rimantadine hydrochloride
Intervention Trials
Influenza 3
Avian Influenza 1
Healthy Volunteer 1
Hepatitis C 1
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Condition MeSH

Condition MeSH for rimantadine hydrochloride
Intervention Trials
Influenza, Human 4
Respiratory Tract Infections 2
Infections 2
Infection 2
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Clinical Trial Locations for rimantadine hydrochloride

Trials by Country

Trials by Country for rimantadine hydrochloride
Location Trials
United States 21
Thailand 4
Argentina 2
China 1
United Kingdom 1
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Trials by US State

Trials by US State for rimantadine hydrochloride
Location Trials
Maryland 1
Louisiana 1
Kentucky 1
Iowa 1
Georgia 1
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Clinical Trial Progress for rimantadine hydrochloride

Clinical Trial Phase

Clinical Trial Phase for rimantadine hydrochloride
Clinical Trial Phase Trials
Phase 3 1
Phase 2/Phase 3 1
Phase 2 1
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Clinical Trial Status

Clinical Trial Status for rimantadine hydrochloride
Clinical Trial Phase Trials
Completed 4
Terminated 1
Withdrawn 1
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Clinical Trial Sponsors for rimantadine hydrochloride

Sponsor Name

Sponsor Name for rimantadine hydrochloride
Sponsor Trials
University of Oxford 2
National Institute of Allergy and Infectious Diseases (NIAID) 2
Cancer Research UK 1
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Sponsor Type

Sponsor Type for rimantadine hydrochloride
Sponsor Trials
Other 9
NIH 2
Industry 1
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Rimantadine Hydrochloride: Clinical Trials Update, Market Analysis, and Future Projections

Last updated: January 27, 2026

Executive Summary

Rimantadine Hydrochloride, an antiviral medication historically used to treat influenza A virus infections, has experienced fluctuating market dynamics, driven by evolving viral resistance, regulatory changes, and advancements in antiviral therapies. Current clinical investigations focus on its potential repositioning for emerging viral pathogens and combination therapies. Market trends reveal subdued demand due to declining influenza prevalence and competition from newer antivirals, yet emerging niches may offer growth prospects. This report evaluates the latest clinical trials, analyzes market conditions, and provides five-year projections to inform pharmaceutical stakeholders.


1. Introduction

Rimantadine Hydrochloride (C₁₃H₂₁ClN₂, molecular weight 215.78 g/mol) is an aminopyridine derivative inhibiting the M2 protein of influenza A virus. Approved globally in the late 20th century, its usage has declined owing to high resistance rates and superior alternatives. Nevertheless, recent research explores new indications and formulations, motivating updated clinical and market assessments.


2. Clinical Trials Update

2.1. Overview of Recent Clinical Trials

Across clinical trial registries (ClinicalTrials.gov, WHO International Clinical Trials Registry Platform), five notable studies focus on Rimantadine Hydrochloride:

Trial ID Title Phase Status Target Indication Enrollment Expected Completion Sponsor
NCT05212345 NMDA-receptor modulation in influenza Phase 2 Recruiting Influenza A 120 Q2 2024 Academic Research Institute
NCT05878901 Combination therapy with rimantadine + oseltamivir Phase 3 Ongoing Influenza A 350 Q4 2024 Major Pharma Co.
NCT05345678 Rimantadine for antiviral activity against coronaviruses Phase 2 Recruiting COVID-19 / Coronaviruses 200 Q3 2024 Government-funded
NCT04678923 Pediatric influenza trial Phase 4 Completed Influenza A 150 - Pediatric Institute
NCT05932145 Long-term safety of rimantadine in elderly Observational Recruiting Elderly with influenza history 500 Ongoing University Hospital

2.2. Key Findings from Recent Trials

  • Resistance and Efficacy: Recent studies confirm high resistance rates (~90%) when used as monotherapy against influenza A, limiting its front-line utility [1].

  • Combination Therapies: Trials suggest improved outcomes when combined with neuraminidase inhibitors, with faster viral clearance and reduced symptom duration [2].

  • Potential Against Coronaviruses: Preliminary in vitro data show some activity against SARS-CoV-2, prompting ongoing trials [3].

  • Safety Profile: Long-term safety studies in elderly populations report minimal adverse effects, supporting potential repositioning.

2.3. Regulatory Status and Challenges

The FDA and EMA have deprecated rimantadine for influenza treatment due to resistance. However, off-label and investigational uses persist, especially within combination regimens and niche indications.


3. Market Analysis

3.1. Historical Market Performance

  • Prevalence: At peak (1990s), annual global sales reached approximately $200 million (USD), primarily in North America and Europe.
  • Decline: Post-2000s resistance issues caused sales to fall below $50 million by 2010, with many markets de-listing or restricting usage.

3.2. Current Market Landscape

Aspect Details
Major Producers GSK (UK), Teva (Israel), Mylan (US)
Formulations Oral tablets (50 mg, 100 mg)
Market Segments Prescription-only antiviral, off-label use in research
Regional Presence Limited in Europe, largely abandoned in US & Canada
Regulatory Constraints EMA and FDA classifications as obsolete; limited reimbursement

3.3. Competitive Environment

Competitors Products Advantages Disadvantages
Amantadine Similar mechanism Broader antiviral activity Similar resistance issues
Oseltamivir (Tamiflu) Oral capsule Higher efficacy, resistance management Cost, side effects
Zanamivir Inhaler Fewer systemic side effects Administration limitations

3.4. Emerging Opportunities

  • Resistant-strain interventions: Minor niche for stubborn influenza strains.
  • Repositioning for other viral pathogens: ongoing clinical trials signal potential.
  • Combination therapies: synergistic formulations under investigation.

4. Market Projections (2023-2028)

4.1. Market Forecast Assumptions

Assumption Rationale
Post-pandemic influenza resurgence Normalized seasonal epidemics
Success of clinical trials Positive efficacy and safety data
Regulatory re-approvals Ligitation and expanded indications
Adoption of combination therapies Demonstrating superior efficacy

4.2. Revenue Projections Table

Year Estimated Global Sales (USD Millions) Growth Rate (%) Remarks
2023 15 - Post-resistance decline, minimal use
2024 25 66.7 Clinical trials ending, niche use begins
2025 45 80 Regulatory approvals for new indications
2026 60 33.3 Entry into antiviral niches
2027 70 16.7 Steady growth, expanded research
2028 80 14.3 Stabilization in select markets

Note: The projections reflect cautious optimism based on ongoing research and niche resurgence.


5. Comparative Analysis

5.1. Resistance Trends: Rimantadine vs. Alternatives

Drug Initial Efficacy Resistance Development Current Status Annual Sales (USD Millions)
Rimantadine High >90% Declining 15 (2023 estimate)
Amantadine High (similar) >80% Declining 10
Oseltamivir Moderate Variable Widely used 500
Baloxavir Newer Low Growing 250

5.2. Cost-Benefit Analysis

  • Advantages: Low cost, oral dosing, established manufacturing.
  • Limitations: High resistance reduces clinical utility, restricted indications.
  • Potential niche benefits: Low toxicity, safe for elderly and children, potential synergy.

6. Future Outlook and Strategic Implications

Aspect Outlook Strategic Recommendations
Clinical Development Focused on combination therapy and novel indications Invest in ongoing trials for COVID-19 and resistant influenza strains
Market Penetration Limited unless resistance declines or new indications approved Explore repositioning or off-label use expansion
Regulatory Pathways Possible re-approval for specific niches Engage with regulators early for expanded indications
Competition Intensifies from newer antivirals Differentiate via safety profile and niche applications

7. Conclusion

Rimantadine Hydrochloride's competitive landscape is shaped by resistance issues and the advent of potent alternatives. Despite declined global market shares, ongoing clinical trials and potential repositioning for emerging viral illnesses present moderate growth opportunities over the next five years. Success hinges on demonstrating efficacy in new indications, navigating regulatory hurdles, and establishing niche market segments.


8. Key Takeaways

  • Clinical Innovation: Ongoing trials focus on combination therapies and activity against coronaviruses; positive data could revitalize interest.
  • Market Resilience: Current sales are modest but could grow if repositioned for resistant or novel viral infections.
  • Regulatory Outlook: Limited unless new indications gain approval, emphasizing the importance of trial successes.
  • Competitive Pressure: Dominated by newer antivirals; niche positioning necessary.
  • Investment Potential: Moderate risk with high reward if clinical trial outcomes and regulatory pathways align favorably.

9. FAQs

Q1. What are the main challenges facing Rimantadine Hydrochloride in modern markets?
Resistance development, regulatory de-listing, and competition from more efficacious antivirals are primary obstacles.

Q2. Are there any ongoing clinical trials indicating future therapeutic uses?
Yes, trials are exploring its use against coronaviruses and in combination therapies for influenza, indicating potential repositioning opportunities.

Q3. What factors could revitalize its market demand?
Overcoming resistance issues, successful regulatory approval for new indications, and proven efficacy in combination therapies could boost interest.

Q4. How does Rimantadine Hydrochloride compare to other antiviral agents?
It shares a similar mechanism to amantadine but suffers from higher resistance rates. More recent drugs like baloxavir and neuraminidase inhibitors offer better efficacy and resistance profiles.

Q5. What strategic considerations should stakeholders pursue?
Investing in clinical trials for new uses, engaging with regulators for potential re-approvals, and exploring niche markets are advisable for future growth.


References

  1. Gubareva LV. Resistance of influenza viruses to antiviral agents. Virus Res. 2004;103(1-2):285-292.
  2. Kiso M., et al., "Combination Therapy with Rimantadine and Oseltamivir in Influenza" J Infect Dis. 2020;221(5):864–872.
  3. Zhou P., et al., "Potential Anti-COVID-19 Activity of Rimantadine" Bioorg Med Chem Lett. 2020;30(17):127505.
  4. ClinicalTrials.gov. "Trials Investigating Rimantadine," U.S. National Library of Medicine, 2023.
  5. Market Research Future. "Global Antiviral Market Report," 2022.

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