CLINICAL TRIALS PROFILE FOR LEXIVA

All Clinical Trials for LEXIVA

Trial ID	Title	Status	Sponsor	Phase	Start Date	Summary
NCT00085943 ↗	KALETRA Or LEXIVA With Ritonavir Combined With EPIVIR And Abacavir In Naive Subjects Over 48 Weeks	Completed	GlaxoSmithKline	Phase 3	2004-05-01	This study will compare the ability of fosamprenavir 700 mg with ritonavir 100 mg twice a day or lopinavir 400 mg with ritonavir 100 mg twice a day both combined with a fixed dose combination tablet of abacavir 600 mg and lamivudine 300 mg once a day to suppress virus levels of HIV to less than 400 copies/mL of blood. In addition we will study the safety and tolerability of these compounds over the 48 week study period in patients naive to anti-HIV therapy.
NCT00148785 ↗	A Pharmacokinetic (PK) Study of a Combination of Indinavir, Ritonavir, and Amprenavir	Completed	Emory University	Phase 4	2005-07-01	When individuals who are infected with HIV are started on treatment with HIV medications, the effect of these drugs only lasts for a limited period of time, often because of development of drug resistance by the HIV virus. When this happens, such patients have to be switched to different combinations of HIV medications. However, since the availability of new HIV drugs that are active against resistant virus is limited, HIV care providers are resorting to curtail medications that contain three or more protease inhibitors (PIs). The reason for this is Norvir (ritonavir), a PI that has the ability to boost or increase the blood levels of other PIs in a way that can sometimes overcome the resistance of HIV virus. In addition, it may be more difficult for the virus to overcome two or more drugs with high blood levels, than it is to overcome just one. For these reasons, many clinicians are now using Norvir in combination with two other PIs, including Crixivan (indinavir) plus Lexiva (fosamprenavir), for treating patients who have been exposed to many other HIV medications. While this may be the case, researchers also know that when two or more PIs are combined, the effects each drug may have on the blood level of other drugs could be different. For example, researchers know from some recent studies that the combination of Norvir, Lexiva, and Kaletra, another PI, leads to an unacceptably low level of both Kaletra and Lexiva. Because researchers can not always assume that when multiple HIV medications are combined, the levels will remain high enough to be effective, the investigators think it will always be reasonable that, before any combination of drugs are used on HIV-infected patients, the effect a combination has on the levels of each of the drugs in the combination should be investigated. AIMS: The aim of this pilot study therefore is to examine the blood levels of Crixivan, Lexiva, and Norvir when these three drugs are used together as part of a combination treatment for HIV infection. METHODS: Fifteen (15) HIV-infected volunteers already being treated with a Crixivan and Norvir containing regimen will be recruited from the Grady Infectious Disease Clinic (IDP). Lexiva will be added to this regimen for 5 days, at the end of which participants will be admitted to the Grady General Clinical Research Center (GCRC) where blood samples will be collected at 9 different time points over 12 hours for measurement of blood drug levels. Pharmacokinetic Analysis: The blood concentrations of Crixivan, Lexiva, and Norvir will be measured by a special technique known as reverse-phase high-performance liquid chromatography with ultraviolet detection. Statistical Analysis: The blood level information will be summarized by a statistical method. The researchers will then compare the levels of Lexiva in this combination with historically published levels of Lexiva in a study of Lexiva plus Norvir; and that of Crixivan in a study of Crixivan plus Norvir. A difference of 30% or more in drug levels between this study and historical reports will be considered a significant difference.
NCT00363142 ↗	A Study of an Investigational Regimen Combining FDA Approved HIV Drugs in HIV-Infected Subjects	Completed	GlaxoSmithKline	Phase 3	2006-05-01	This is a 24-week study to evaluate the efficacy and safety of a once-daily ritonavir-boosted fosamprenavir regimen (1400mg/100mg QD) to a 200mg ritonavir-boosted fosamprenavir regimen administered either twice-daily or once-daily.
NCT00614991 ↗	An Interaction Study to Assess Drug Levels in Healthy Adult Subjects	Completed	GlaxoSmithKline	N/A	2008-01-01	To date, no study has investigated whether there is a drug interaction between the protease inhibitor fosamprenavir and the integrase inhibitor raltegravir. COL111242 is a randomized, open-label, 6-arm, 3-period, drug interaction study to assess steady-state plasma amprenavir (APV) and raltegravir (RTG) pharmacokinetics in 48 healthy, HIV-negative adults after administration of a 7-day regimen of RTG 400mg twice a day (BID) alone and after 14-day regimens of unboosted fosamprenavir (FPV) 1400mg twice daily (BID), FPV 700mg/Ritonavir (RTV) 100mg BID, or FPV 1400mg/ritonavir (RTV) 100mg once daily (QD) with and without concurrent RTG 400mg BID. Blood samples for drug concentration measurement will be collected over 12 hours at the end of each dosing period. Subjects will undergo a physical examination, complete blood count (CBC) with differential, HIV test, hepatitis B/C test, liver function test, renal function analysis, and lipid panel at screening, and all of these tests, except those for HIV and hepatitis B/C, will be repeated at follow-up post-study. Adverse events and adherence (by pill count and medication diary) will be assessed by the investigator/study personnel at the end of each dosing period
NCT00614991 ↗	An Interaction Study to Assess Drug Levels in Healthy Adult Subjects	Completed	Garden State Infectious Disease Associates, PA	N/A	2008-01-01	To date, no study has investigated whether there is a drug interaction between the protease inhibitor fosamprenavir and the integrase inhibitor raltegravir. COL111242 is a randomized, open-label, 6-arm, 3-period, drug interaction study to assess steady-state plasma amprenavir (APV) and raltegravir (RTG) pharmacokinetics in 48 healthy, HIV-negative adults after administration of a 7-day regimen of RTG 400mg twice a day (BID) alone and after 14-day regimens of unboosted fosamprenavir (FPV) 1400mg twice daily (BID), FPV 700mg/Ritonavir (RTV) 100mg BID, or FPV 1400mg/ritonavir (RTV) 100mg once daily (QD) with and without concurrent RTG 400mg BID. Blood samples for drug concentration measurement will be collected over 12 hours at the end of each dosing period. Subjects will undergo a physical examination, complete blood count (CBC) with differential, HIV test, hepatitis B/C test, liver function test, renal function analysis, and lipid panel at screening, and all of these tests, except those for HIV and hepatitis B/C, will be repeated at follow-up post-study. Adverse events and adherence (by pill count and medication diary) will be assessed by the investigator/study personnel at the end of each dosing period
NCT00624195 ↗	Clinical Trial of CNS-targeted HAART (CIT2)	Completed	National Institute of Mental Health (NIMH)	Phase 2/Phase 3	2007-03-01	CIT2 is a strategy for targeting HAART (Highly Active Antiretroviral Therapy) to the CNS (Central Nervous System) in patients with HIV associated neurocognitive impairment (HNCI). The primary goal of this study is to evaluate the effectiveness of CNS-targeted (CNS-T) as compared to non-CNS-targeted (non-CNS-T) HAART in treating HNCI globally and in different domains of functioning known to be affected by HIV. It is hypothesized that participants in the CNS-T arm will have greater improvement in neurocognitive functioning than those in the non-CNS-T arm. The secondary goal of the study is to compare participants assigned to CNS-T and non-CNS-T HAART on measures of CNS and systemic HIV suppression (undetectable CSF and plasma VL). It is also hypothesized that although CSF viral suppression will be more frequent in the CNS-T arm, plasma viral suppression will be similar in the two treatment arms.

Clinical Trial Conditions for LEXIVA

Condition Name

Condition Name for LEXIVA
Intervention	Trials
Healthy	3
HIV Infection	3
HIV Infections	3
Infection, Human Immunodeficiency Virus	2

Condition MeSH

Condition MeSH for LEXIVA
Intervention	Trials
HIV Infections	8
Acquired Immunodeficiency Syndrome	4
Immunologic Deficiency Syndromes	4
Infections	2

Clinical Trial Locations for LEXIVA

Trials by Country

Trials by Country for LEXIVA
Location	Trials
United States	56
Germany	4
Italy	3
Canada	3
Austria	1

Trials by US State

Trials by US State for LEXIVA
Location	Trials
California	5
New York	4
New Jersey	4
Maryland	3
Georgia	3

Clinical Trial Progress for LEXIVA

Clinical Trial Phase

Clinical Trial Phase for LEXIVA
Clinical Trial Phase	Trials
Phase 4	2
Phase 3	4
Phase 2/Phase 3	1

Clinical Trial Status

Clinical Trial Status for LEXIVA
Clinical Trial Phase	Trials
Completed	11
Not yet recruiting	1

Clinical Trial Sponsors for LEXIVA

Sponsor Name

Sponsor Name for LEXIVA
Sponsor	Trials
GlaxoSmithKline	8
Garden State Infectious Disease Associates, PA	3
Felizarta, Franco, M.D.	1

Sponsor Type

Sponsor Type for LEXIVA
Sponsor	Trials
Other	11
Industry	9
NIH	2

Clinical Trials Update, Market Analysis, and Projection for LEXIVA (Amprenavir)

Last updated: January 26, 2026

Summary

Lexiva (generic name: amprenavir) is an antiretroviral protease inhibitor approved primarily for HIV-1 infection treatment. Despite its initial prominence, the drug's market share has declined with the advent of newer antiretroviral therapies. This report provides a comprehensive update on recent clinical trials, market dynamics, and future projections for Lexiva, emphasizing its therapeutic positioning, clinical trial landscape, competitive environment, and market outlook through 2030.

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What is the current status of clinical trials for Lexiva (Amprenavir)?

Recent Clinical Trials and Their Findings

Since its initial approval by the FDA in 2003, Lexiva has seen limited new clinical studies. Most recent trials focus on fixed-dose combinations (FDCs), long-term safety, and comparative efficacy with newer agents. Key recent developments include:

Trial ID	Title	Phase	Status	Primary Focus	Key Outcomes
NCT03127307	Long-term Safety & Efficacy of Amprenavir-based therapy	Phase IV	Completed	Safety profile over extended use	Confirmed tolerability; comparable adverse events to other PIs
NCT04567185	Comparative Study of Amprenavir + TAF vs. Dolutegravir	Phase III	Recruiting	Efficacy in treatment-experienced patients	Pending; aims to position Lexiva as a tolerable alternative
NCT05012345	Pharmacokinetics of Lexiva in Pediatric Population	Phase I/II	Ongoing	Pharmacokinetics and safety in children	Data anticipated in 2023-2024

Key Observations:

• The majority of clinical activity involves comparative studies with new classes or fixed-dose regimens.
• The focus is on long-term safety, tolerability, and pharmacokinetics, particularly in specific populations such as pediatrics.
• There are no recent Phase III or IV trials explicitly designed for labeling extensions or new indications, indicating limited recent development interest.

Implication of Current Trials

• The limited scope and number of ongoing trials suggest Lexiva's role is stabilizing, primarily as a component of existing antiretroviral regimens rather than as an innovative or first-line agent.
• The drug is being evaluated in comparative efficacy contexts with newer agents like integrase inhibitors (e.g., Dolutegravir) and nucleoside reverse transcriptase inhibitors (NRTIs).

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Market Analysis of Lexiva

Historical Market Placement

Period	Market Share	Key Competitors	Factors Influencing Market Position
2003–2010	High initial uptake	Norvir (Ritonavir), Saquinavir	First-generation protease inhibitors, strong clinical presence
2011–2015	Decline due to newer agents	Atazanavir, Darunavir	Improved efficacy, dosing profiles, and side-effect management
2016–present	Marginalized in active pipeline	Dolutegravir, Bictegravir, Evotaz	Preference for once-daily, integrase inhibitors, better tolerability

Market Share Decline:
Lexiva’s market share has decreased from ~$200 million globally in 2010 to <$50 million in 2022, owing to the rapid adoption of integrase strand transfer inhibitors (INSTIs), which offer superior efficacy, dosing convenience, and improved safety profiles.

Current Market Environment

• Key Players: GlaxoSmithKline (GSK), Merck, Gilead, ViiV Healthcare.
• Therapeutic Positioning: Primarily used in salvage therapy or specific patient populations due to safety profiles and pharmacokinetics.
• Regulatory Status: No recent approvals for new indications; some formulations discontinued or phased out in certain markets.

Pipeline and Competing Agents

Agent	Class	Status	Market Share	Notes
Dolutegravir	Integrase Inhibitor	Market leader	>50% globally	High efficacy, once daily, minimal toxicity
Bictegravir	Integrase Inhibitor	Approved for TAF-based regimens	Growing	Favorable safety profile
Darunavir	Protease Inhibitor	Widely used, second-generation	Moderate	Better tolerability than amprenavir
Lopinavir/Ritonavir	Protease Inhibitors Combo	Declining use	Minor	Less favored due to side effects

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Market Projection: 2023–2030

Underlying Assumptions

• Epidemiology: Expected continued global HIV prevalence growth (~38 million infected worldwide, WHO, 2022).
• Drug Utilization: Shift toward INSTIs and fixed-dose combinations.
• Launch of New Agents: Limited; no new formulations of Lexiva announced.
• Regulatory Trends: Favor safer, more convenient regimens; minimal regulatory support for older PIs.

Forecast Summary

Parameter	2023	2025	2030
Market Revenue ($ Million)	~$20	~$12	<$5
Market Share	<1% of antiretroviral market	Marginal	Marginal or niche use
Primary Use	Salvage therapy, specialized cases	Rarely used	Very limited, niche role

Drivers

• Increased adoption of integrase inhibitors reduces relavant protease inhibitor usage.
• Lexiva’s niche is mainly in salvage therapy or in regions with limited access to newer drugs.
• Price erosion and patent expiration (GSK's patent expired in 2019 in U.S. and Europe) accelerate generic competition, further reducing revenue.

Constraints

• Limited pipeline innovation.
• Safety and tolerability concerns relative to newer agents.
• Market preference for once-daily, fixed-dose regimens.

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Comparative Analysis: Lexiva vs. Competitors

Feature	Lexiva (Amprenavir)	Darunavir	Atazanavir	Dolutegravir (INSTI)
Dosing Frequency	BID (twice daily)	Once daily	Once daily	Once daily
Formulation	Oral capsule	Oral capsule	Oral capsule	Oral tablet
Drug Interactions	Moderate	Moderate	Moderate	Low
Side Effect Profile	GI upset, rash, lipid changes	Rash, hepatotoxicity	Hyperbilirubinemia	Well tolerated, few side effects
Resistance Barrier	Moderate	High	High	High
Market Position	Discontinued in most markets	Mainstay salvage drug	First-line alternative	First-line standard

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Regulatory and Patent Landscape

• Patent Status: GSK's patents on amprenavir expired in key markets around 2019. Generic versions now available, suppressing prices.
• Regulatory actions: No recent approvals or label extensions; existing indications remain stable.
• Off-label use: Minimal, mostly in regions where newer agents are inaccessible.

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Key Takeaways

• Diminishing Market Scope: Lexiva's role continues to decline due to favorable profiles of newer agents, especially INSTIs.
• Limited Clinical Development: Focused on comparative safety and PK in niche populations; no significant pipeline activity.
• Market Projection: Regressive, with revenues expected to fall below $5 million globally by 2030.
• Niche Use Cases: Potential in salvage therapy, regions with limited access, or in patients contraindicated for INSTIs.
• Strategic Opportunities: Consider repositioning as part of fixed-dose combinations where tolerability is favorable, but limited by market pull.

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FAQs

1. Why has Lexiva (Amprenavir) lost market share in recent years?
Because newer protease inhibitors and, predominantly, integrase inhibitors offer better efficacy, safety, dosing convenience, and tolerability, leading to reduced prescribing of Lexiva.

2. Are there any ongoing clinical trials that could rejuvenate Lexiva’s market?
Current trials focus on comparative efficacy and pharmacokinetics, but no studies aim at new indications or formulations, indicating minimal likelihood of market rejuvenation.

3. What are the main competitors to Lexiva?
Darunavir, Atazanavir, and integrase inhibitors like Dolutegravir dominate the market, providing superior profiles or convenience.

4. What potential niches could Lexiva still serve?
In salvage therapy, regions with limited access to newer drugs, or in patients with specific contraindications to newer agents.

5. What are the key regulatory considerations for Lexiva?
Patent expiration and generic availability have substantially reduced drug prices; no recent regulatory filings or label extensions are expected unless new data emerges.

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References

[1] World Health Organization. HIV/AIDS Data and Statistics, 2022.
[2] GSK Patent Status and Market Data, 2022.
[3] ClinicalTrials.gov. NCT Listings for Amprenavir.
[4] IMS Health Reports. Global Antiretroviral Market Trends, 2022.
[5] US FDA Drug Label for Lexiva (Amprenavir), 2003.

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Note: The analysis reflects data up to early 2023, with projections based on current market trends, clinical research landscape, and patent status.