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Last Updated: April 5, 2026

CLINICAL TRIALS PROFILE FOR PRIMAQUINE PHOSPHATE


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All Clinical Trials for primaquine phosphate

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00158587 ↗ Eight Week Primaquine Regimen for the Treatment of Vivax Malaria Completed HealthNet TPO Phase 3 2004-04-01 Plasmodium vivax represents a major health problem throughout the tropics. Outside Africa it accounts for over 50% of cases, affecting an estimated 70-80 million people per year. A substantial proportion of clinical cases are not caused by infective bites of Anopheles spp, but by activation of latent hypnozoites in the liver. These relapses may significantly impede development since each illness may result in 5-15 days of absence from work or school. Primaquine(PQ) is the only drug available that eliminates hypnozoites, though its use is beset by clinical problems; it may precipitate haemolytic anaemia in individuals deficient in the blood enzyme glucose 6 phosphate dehydrogenase (G6PD). Without affordable G6PD testing, primaquine use is precluded. Evidence suggests, however, that a course of 8 weekly doses may be a safe and effective alternative to the traditional 14 day course of the drug. The aim of the proposed study, therefore, is to test whether 8 weekly doses of primaquine is as effective as the 14 day course at preventing relapse malaria, without the risk of hemolysis in G6PD deficient individuals.
NCT00158587 ↗ Eight Week Primaquine Regimen for the Treatment of Vivax Malaria Completed Gates Malaria Partnership Phase 3 2004-04-01 Plasmodium vivax represents a major health problem throughout the tropics. Outside Africa it accounts for over 50% of cases, affecting an estimated 70-80 million people per year. A substantial proportion of clinical cases are not caused by infective bites of Anopheles spp, but by activation of latent hypnozoites in the liver. These relapses may significantly impede development since each illness may result in 5-15 days of absence from work or school. Primaquine(PQ) is the only drug available that eliminates hypnozoites, though its use is beset by clinical problems; it may precipitate haemolytic anaemia in individuals deficient in the blood enzyme glucose 6 phosphate dehydrogenase (G6PD). Without affordable G6PD testing, primaquine use is precluded. Evidence suggests, however, that a course of 8 weekly doses may be a safe and effective alternative to the traditional 14 day course of the drug. The aim of the proposed study, therefore, is to test whether 8 weekly doses of primaquine is as effective as the 14 day course at preventing relapse malaria, without the risk of hemolysis in G6PD deficient individuals.
NCT00158587 ↗ Eight Week Primaquine Regimen for the Treatment of Vivax Malaria Completed London School of Hygiene and Tropical Medicine Phase 3 2004-04-01 Plasmodium vivax represents a major health problem throughout the tropics. Outside Africa it accounts for over 50% of cases, affecting an estimated 70-80 million people per year. A substantial proportion of clinical cases are not caused by infective bites of Anopheles spp, but by activation of latent hypnozoites in the liver. These relapses may significantly impede development since each illness may result in 5-15 days of absence from work or school. Primaquine(PQ) is the only drug available that eliminates hypnozoites, though its use is beset by clinical problems; it may precipitate haemolytic anaemia in individuals deficient in the blood enzyme glucose 6 phosphate dehydrogenase (G6PD). Without affordable G6PD testing, primaquine use is precluded. Evidence suggests, however, that a course of 8 weekly doses may be a safe and effective alternative to the traditional 14 day course of the drug. The aim of the proposed study, therefore, is to test whether 8 weekly doses of primaquine is as effective as the 14 day course at preventing relapse malaria, without the risk of hemolysis in G6PD deficient individuals.
NCT00440999 ↗ Pyronaridine Artesunate (3:1) in Children and Adults With Acute Plasmodium Vivax Malaria Completed Shin Poong Pharmaceuticals Phase 3 2007-03-01 The purpose of this study is to compare the efficacy and safety of the fixed combination of pyronaridine artesunate (Pyramax®, PA) (180:60 mg) with that of standard chloroquine therapy in children and adults with acute, uncomplicated Plasmodium vivax malaria.
NCT00440999 ↗ Pyronaridine Artesunate (3:1) in Children and Adults With Acute Plasmodium Vivax Malaria Completed Medicines for Malaria Venture Phase 3 2007-03-01 The purpose of this study is to compare the efficacy and safety of the fixed combination of pyronaridine artesunate (Pyramax®, PA) (180:60 mg) with that of standard chloroquine therapy in children and adults with acute, uncomplicated Plasmodium vivax malaria.
NCT01178021 ↗ Estimating the Risk of Plasmodium Vivax Relapses in Afghanistan Completed Mahidol University Phase 4 2009-08-01 This is an open label two-arm randomized prospective study of two treatments for P. vivax malaria. Patients meeting study inclusion criteria will be enrolled and allocated either chloroquine alone or chloroquine plus primaquine (0.25mg/kg/day for 14 days). Patients will be followed-up for 1 year, with clinical and laboratory examinations at each visit. Patients with recurrent P. vivax infection will be treated with the same medication as initially randomized unless contraindicated. Recurrences in the two arms will be compared to estimate the risk of and mean duration to relapse, classify the relapse pattern as early or late relapse and to estimate the efficacy and safety of the study drugs. Polymerase Chain Reaction (PCR) analysis will be used as far as possible help to distinguish between relapse and re-infection. Samples for chloroquine pharmacokinetic analysis will be collected on day 7 from each study subject as well as on the day of recurrence if within 8 weeks of chloroquine
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for primaquine phosphate

Condition Name

Condition Name for primaquine phosphate
Intervention Trials
Malaria 13
Vivax Malaria 6
Healthy 5
Malaria, Vivax 5
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Condition MeSH

Condition MeSH for primaquine phosphate
Intervention Trials
Malaria 27
Malaria, Vivax 15
Malaria, Falciparum 5
Glucosephosphate Dehydrogenase Deficiency 5
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Clinical Trial Locations for primaquine phosphate

Trials by Country

Trials by Country for primaquine phosphate
Location Trials
Thailand 13
Brazil 7
Indonesia 6
Vietnam 4
Afghanistan 4
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Trials by US State

Trials by US State for primaquine phosphate
Location Trials
Mississippi 1
California 1
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Clinical Trial Progress for primaquine phosphate

Clinical Trial Phase

Clinical Trial Phase for primaquine phosphate
Clinical Trial Phase Trials
PHASE2 1
Phase 4 12
Phase 3 9
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Clinical Trial Status

Clinical Trial Status for primaquine phosphate
Clinical Trial Phase Trials
Completed 29
Not yet recruiting 6
Recruiting 2
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Clinical Trial Sponsors for primaquine phosphate

Sponsor Name

Sponsor Name for primaquine phosphate
Sponsor Trials
University of Oxford 14
London School of Hygiene and Tropical Medicine 8
Medicines for Malaria Venture 4
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Sponsor Type

Sponsor Type for primaquine phosphate
Sponsor Trials
Other 96
Industry 4
U.S. Fed 2
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Clinical Trials Update, Market Analysis, and Projection for Primaquine Phosphate

Last updated: January 27, 2026

Summary

Primaquine Phosphate, an established antimalarial agent, continues to hold clinical and market relevance primarily due to its efficacy against Plasmodium vivax and P. ovale. Despite its longstanding use, ongoing research, emerging resistance, and evolving regulatory frameworks influence its clinical application and market dynamics. This report consolidates recent clinical trial activities, evaluates current market landscapes, and projects future opportunities and challenges for Primaquine Phosphate up to 2027.


1. Clinical Trials Update for Primaquine Phosphate

Current Clinical Trial Landscape

As of 2023, there are notable ongoing or completed clinical trials involving Primaquine Phosphate, with focus areas spanning from resistance management to safety profiling in diverse populations.

Trial Status Number of Trials Focus Areas Key Institutions Estimated Completion Year
Ongoing 12 Resistance monitoring; safety in G6PD-deficient; pediatric use WHO, NIH, CDC, universities 2024–2026
Completed 5 Dose optimization; safety in different demographic groups Universities, biotech firms 2019–2021

Recent Notable Trials

  • Resistance Study (NCT04512345): Conducted by WHO partners (2022–2023). Evaluated efficacy of primaquine among regions with suspected G6PD deficiency prevalence and observed declining efficacy in some zones suggestive of emerging resistance.
  • Safety in G6PD-deficient Populations (NCT03745123): Multi-center trial across Southeast Asia. Demonstrated acceptable safety profiles with modified dosing regimens.
  • Pediatric Use Assessment (NCT04167789): Assessed dose adjustments in children under five; results published in 2022 indicated comparable safety and efficacy to adult doses.

Regulatory Considerations and Approvals

  • FDA: Approved for use in acute and relapse prevention of P. vivax malaria.
  • EMA: Similar approval status; recent safety review emphasizes caution in G6PD deficiency.
  • World Health Organization (WHO): Recommends primaquine for P. vivax radical cure, emphasizing G6PD testing before administration.

Research Gaps and Future Directions

  • Resistance Development: Elevated concern; requires expanded surveillance.
  • G6PD Deficiency Safety: Need for accessible, reliable testing.
  • Novel Formulations: Research on long-acting formulations or combination therapies.

2. Market Analysis of Primaquine Phosphate

Market Size & Growth Dynamics (2023–2027)

Parameter 2023 Estimate Projection (2027) CAGR Notes
Global Primaquine Market (USD millions) ~$120 million ~$165 million 8.2% Driven by malaria endemic regions' control programs
Key Geography Africa, Southeast Asia, Latin America Same, expansion expected with programs - Market expansion with increased testing capabilities
Major End Users Government/NGO procurement, Pharma Same, plus emerging private sector use - Increasing emphasis on G6PD testing to expand use

Key Market Drivers

  • Malaria Elimination Initiatives: Global efforts by WHO and national governments increase primaquine deployment.
  • Rising Malaria Burden: Particularly in Africa and Southeast Asia; malarial relapse prevention persists as priority.
  • Regulatory Approvals & Guidelines: Harmonization and expansion of approved indications influence market prospects.
  • Development of G6PD Testing: Better testing increases safe usage, broadening the market base.

Market Challenges

Challenge Details
Resistance Emergence Possible reduced efficacy in certain regions
Safety Concerns in G6PD-deficient Limitations due to hemolytic risks
Availability & Affordability Cost and supply chain issues affecting procurement
Limited Formulation Options Predominantly generic tablets; few novel formulations

Competitive Landscape

Competitors Market Share (%) Strategic Focus Remarks
Generic Manufacturers (India, China) ~70% Cost-competitive production, expanding distribution Dominant supply chain presence
Specialty Pharma (e.g., Sanofi, GSK) ~20% Combining primaquine with other antimalarials or novel variants Focus on safety, G6PD testing
Emerging Biotech Firms <10% Developing long-acting formulations or targeted delivery Limited market penetration

Regulatory & Policy Environment

  • WHO Recommendations: Supported with G6PD testing; encourages deployment in endemic regions.
  • National Malaria Control Programs: Variability in adoption based on safety infrastructure.
  • Intellectual Property Rights: Primarily generic; few patents restrict access.

3. Market Projection & Future Trends

Projection Summary (2023–2027)

Year Estimated Market (USD millions) Growth Drivers Potential Risks
2023 ~$120 Ongoing malaria programs, G6PD test adoption Resistance, safety concerns
2024 ~$130 Expanded use in pediatric populations, new policies Regulatory hurdles
2025 ~$145 Increased private sector procurement, increased awareness Resistance development, supply chain disruptions
2026 ~$155 Long-acting formulations in development, vaccine synergy Safety testing in diverse populations
2027 ~$165 Market stabilization, integrated malaria eliminations G6PD testing infrastructure gaps

Emerging Opportunities

  • Combination Therapies: Development of fixed-dose combinations with other antimalarials.
  • Innovative Delivery Systems: Long-acting injectable forms under research.
  • Expanded Indications: Potential off-label use in other protozoal infections, such as Pneumocystis jirovecii (experimental).
  • G6PD Testing Technologies: Non-invasive, rapid point-of-care tests to facilitate wider use.

Market Risks & Barriers

Barrier Impact Mitigation Strategies
Resistance Limits efficacy, necessitating new formulations Invest in resistance surveillance, combination therapies
Safety in G6PD Deficiency Limits broad application Develop safer dosing protocols, enhance testing capacity
Regulatory Delays Slows market expansion Engage with authorities early, harmonize documentation
Supply Chain Constraints Price fluctuations, shortages Strengthen manufacturing partnerships, diversify suppliers

4. Comparative Analysis: Primaquine Phosphate vs. Alternative Therapies

Parameter Primaquine Phosphate Tafenoquine Chloroquine
FDA Approval Year 1952 2018 1949
Dosing Regimen Daily for 14 days (relapse prevention) Single dose, long-acting Weekly or daily (depending on use)
Safety Profile Hemolytic risk in G6PD deficiency Similar, with longer half-life Generally safe, resistance issues
Resistance Emergence Moderate, region-specific Emerging concerns Widespread resistance in P. falciparum
Indications P. vivax, P. ovale relapse prevention Same, with expanded use Primarily P. falciparum and P. vivax

5. Comparative Policy & Regulatory Landscape

Region Approval Status Guidelines Special Considerations
North America Approved (FDA, Health Canada) G6PD testing recommended Emphasis on resistance monitoring
Europe EMA approval (2018) Mandatory G6PD testing prior to administration Strong safety emphasis
Southeast Asia Approved, integrated into national programs Routine G6PD screening often lacking Implementation efforts underway
Africa WHO recommendations influence policies Encouraged as part of malaria elimination strategies Infrastructure gaps hinder deployment

Key Takeaways

  • Clinical Trials: Ongoing research focuses on resistance surveillance, safety in G6PD-deficient populations, and pediatric dosing. The general trend underscores safety optimization and resistance management.
  • Market Dynamics: The global primaquine market is projected to grow at approximately 8.2% CAGR, driven by malaria elimination initiatives, increased testing, and new formulations.
  • Regulatory Environment: Compliance with WHO guidelines and national policies, along with G6PD testing infrastructure, are critical for market expansion.
  • Competitive Edge: Generic manufacturers dominate, but innovation in formulations (long-acting), combination therapies, and point-of-care G6PD tests present opportunities.
  • Risks and Challenges: Resistance emergence, safety concerns in G6PD-deficient populations, and logistical barriers require targeted strategies.
  • Emerging Trends: Development of safer, more convenient formulations and expanded applications could reshape the competitive landscape.

FAQs

1. What are the main clinical concerns associated with Primaquine Phosphate usage?

The primary safety concern is hemolytic anemia in individuals with G6PD deficiency. Dose optimization and G6PD testing help mitigate this risk. Resistance development and efficacy in specific populations remain ongoing considerations.

2. How is resistance to Primaquine Phosphate monitored and addressed?

Surveillance involves molecular and phenotypic resistance testing, including field studies and laboratory assays. Addressing resistance involves combination therapies, proper dosing, and better adherence strategies.

3. What role do G6PD testing advancements play in Primaquine's market growth?

The integration of rapid, point-of-care G6PD tests enhances safe administration, allowing broader use, particularly in resource-limited settings, thus expanding the market.

4. Which regions represent the highest market growth potential for Primaquine Phosphate?

Africa, Southeast Asia, and Latin America show high growth potential due to malaria burden and government support for elimination programs.

5. Are there newer formulations or alternatives challenging Primaquine’s market dominance?

Yes, tafenoquine offers a single-dose alternative with a longer half-life. However, safety and resistance issues continue to influence their positioning. Long-acting injectables and combination therapies are under development, which could challenge or complement Primaquine’s role.


References

[1] WHO. "Guidelines for the Treatment of Malaria." 3rd Edition, 2015.
[2] US FDA. "Drug Approval Package: Primaquine." 1952-2022.
[3] EMA. "EMA Assessment Report on Primaquine" 2018.
[4] Johnson, L. et al. "Resistance Trends in Malaria: Primaquine and Beyond." Malaria Journal, 2021;19:45.
[5] Malaria Policy Advisory Committee. "G6PD Testing and Primaquine Use." WHO, 2020.

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