Recent Updates
Recently added Catalysts

Baloxavir Marboxil

Phase 3FDA approved

Influenza | Small molecule | Infectious Disease |Roche Holding AG|Trials Updated: Sep 24, 2026

Baloxavir Marboxil development status

FDA approval on record Oct 24, 2018 as Xofluza
Approval holderGenentech Inc
ApplicationNDA210854
Highest phase Phase 3
Registered trials 9 across 2 sponsors since Aug 2018

Label indication XOFLUZA is an influenza virus polymerase acidic (PA) endonuclease inhibitor indicated for: Treatment of acute uncomplicated influenza in patients 5 years of age and older who have been symptomatic for no more than 48 hours and who are otherwise healthy or at high risk of developing influenza-related complications . FDA label

Baloxavir Marboxil target and mechanism

Molecular targetPA
ModalitySmall molecule

Also known as Xofluza

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials7
Total Enrollment6,248

FDA Designations

No designations recorded

Baloxavir Marboxil clinical trials

Baloxavir Marboxil · 7 trials · 4 indications

Phase 3 7
NCT07827599A Study to Confirm Efficacy of a Single Dose of Baloxavir Marboxil in the Post-exposure Prophylaxis (PEP) of Influenza Virus Infection in Chinese ParticipantsInfluenza, Human
NOT YET_RECRUITING325 Analytics
NCT06774859Study to Assess the Safety, Pharmacokinetics, and Efficacy of Baloxavir Marboxil in Chinese Pediatric Participants 1 to <12 Years of Age With Influenza SymptomsInfluenza
COMPLETED100 Analytics
NCT06094010A Surveillance Study of Susceptibility to Baloxavir Marboxil in Pediatric Participants With Influenza and Transmission of Influenza to Household ContactsInfluenza
RECRUITING1,100 Analytics
NCT03969212Study to Assess the Efficacy of Baloxavir Marboxil Versus Placebo to Reduce Onward Transmission of Influenza A or B in HouseholdsInfluenza
COMPLETED4,138 Analytics
NCT03653364Study to Assess the Safety, Pharmacokinetics, and Efficacy of Baloxavir Marboxil in Healthy Pediatric Participants From Birth to < 1 Year With Influenza-Like SymptomsInfluenza
COMPLETED49 Analytics
NCT03684044Study to Assess Efficacy and Safety of Baloxavir Marboxil In Combination With Standard-of-Care Neuraminidase Inhibitor In Hospitalized Participants With Severe InfluenzaInfluenza
COMPLETED363 Analytics
NCT03629184Study to Assess the Safety, Pharmacokinetics, and Efficacy of Baloxavir Marboxil in Healthy Pediatric Participants With Influenza-Like SymptomsInfluenza
COMPLETED173 Analytics
PHASE3NOT YET_RECRUITING
A Study to Confirm Efficacy of a Single Dose of Baloxavir Marboxil in the Post-exposure Prophylaxis (PEP) of Influenza Virus Infection in Chinese Participants
Influenza, HumanUnlock trial analytics
PHASE3COMPLETED
Study to Assess the Safety, Pharmacokinetics, and Efficacy of Baloxavir Marboxil in Chinese Pediatric Participants 1 to <12 Years of Age With Influenza Symptoms
InfluenzaUnlock trial analytics
PHASE3RECRUITING
A Surveillance Study of Susceptibility to Baloxavir Marboxil in Pediatric Participants With Influenza and Transmission of Influenza to Household Contacts
InfluenzaUnlock trial analytics
PHASE3COMPLETED
Study to Assess the Efficacy of Baloxavir Marboxil Versus Placebo to Reduce Onward Transmission of Influenza A or B in Households
InfluenzaUnlock trial analytics
PHASE3COMPLETED
Study to Assess the Safety, Pharmacokinetics, and Efficacy of Baloxavir Marboxil in Healthy Pediatric Participants From Birth to < 1 Year With Influenza-Like Symptoms
InfluenzaUnlock trial analytics
PHASE3COMPLETED
Study to Assess Efficacy and Safety of Baloxavir Marboxil In Combination With Standard-of-Care Neuraminidase Inhibitor In Hospitalized Participants With Severe Influenza
InfluenzaUnlock trial analytics
PHASE3COMPLETED
Study to Assess the Safety, Pharmacokinetics, and Efficacy of Baloxavir Marboxil in Healthy Pediatric Participants With Influenza-Like Symptoms
InfluenzaUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants who are Infected With Influenza Virus (Reverse Transcription - Polymerase Chain Reaction [RT-PCR] Positive), and Present With Fever and at Least one Respiratory Symptom
From Day 1 up to Day 10
Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
Up to Day 29

An AE was defined as any untoward medical occurrence in a participant or clinical study participant temporally associated with the use of a study treatment, whether or not considered related to the study treatment. An AE was therefore any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study intervention. An SAE was defined as any untoward medical occurrence that, at any dose, resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent disability or incapacity, was a congenital anomaly or birth defect.

Part A: Percentage of Participants With Resistance-associated Pre-treatment Substitutions
Day 1 (At Baseline)
Part A: Percentage of Participants With Resistance-associated Treatment-emergent Substitutions
Days 4, 6 and 10
Percentage of HHCs With Virological Influenza Transmission by Day 5
Baseline (Day 1) to Day 5

The virological transmission was determined based on Polymerase Chain Reaction Positive (PCR+) influenza test results. The adjusted incidence (cumulative proportion of events by Day 5) rate is reported here. This is defined as percentage of HHCs who tested PCR+ for influenza by Day 5 post IP randomization with virus subtype matching with that of the respective IP, irrespective of being symptomatic or asymptomatic. The adjusted incidence rates presented were estimated using a generalized estimating equations (GEE) approach.

Time to Clinical Improvement
Up to Day 35

Time to Clinical Improvement (TTCI) is defined as Time to Hospital Discharge OR Time to NEWS2 (National Early Warning Score 2) of ≤ 2 maintained for 24 hours.

Percentage of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
Up to Day 29

An adverse event (AE) is any untoward medical occurrence in a participant or clinical investigation participant administered a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product, whether or not considered related to the medicinal (investigational) product. A serious adverse event (SAE) is any significant hazard, contraindication, side effect that is fatal or life-threatening, requires hospitalization or prolongation of an existing hospitalization, results in persistent or significant disability/ incapacity, is a congenital anomaly/ birth defect, is medically significant or requires intervention to prevent one or other of the outcomes listed above.

Secondary Endpoints

Percentage of Participants who are Infected With Influenza Virus (RT-PCR Positive), and Present With Fever or at Least one Influenza Symptom (Respiratory or Systemic)
From Day 1 up to Day 10
Percentage of Participants who are Infected With Influenza Virus (RT-PCR Positive) Regardless of Body Temperature or Influenza Symptoms
From Day 1 up to Day 10
Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
Up to Day 21
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Baloxavir MarboxilEXPERIMENTALHHCs will receive baloxavir marboxil according to their body weight as outlined in the protocol.
PlaceboPLACEBO_COMPARATORHHCs will receive baloxavir marboxil matching placebo according to their body weight as outlined in the protocol.
No InterventionNO_INTERVENTIONIndex participants will not receive any study treatment but will continue to receive SOC treatment for influenza, as per the local guidelines.
OseltamivirACTIVE_COMPARATORParticipants will receive oseltamivir twice a day for 5 days based on body weight.

Interventions

NameTypeDescription
Baloxavir marboxilDRUGBaloxavir marboxil will be administered to the HHCs as per the schedule specified in the protocol.
PlaceboDRUGBaloxavir marboxil matching placebo will be administered to the HHCs as per the schedule specified in the protocol.
OseltamivirDRUGOseltamivir will be administered as oral capsule: 30 mg (if weight ≤15 kg), 45 mg (if weight \> 15 kg to ≥ 23 kg), 60 mg (if weight \> 23 kg to ≤ 40 kg) or 75 mg (if weight \> 40 kg), twice daily (BID) for 5 days.
Unlock Study Design Details

Eligibility Criteria

Age Range5 Years to N/A
SexALL
Healthy VolunteersYes

Inclusion Criteria: Index Participants (Participants With Influenza Virus Infection): * First participant in a household with influenza virus infection in the current influenza season * Fewer than 6 HHCs * Agreement by all household members to participate in the study and comply with the study pro...

Countries:ChinaUnited StatesBulgariaPolandSpainCosta RicaGreeceHungaryIndiaIsraelJapanMexicoPuerto RicoSouth AfricaTurkey (Türkiye)United KingdomFinlandRussiaArgentinaAustraliaBelgiumBrazilCanadaCzechiaEstoniaFranceGermanyHong KongNetherlandsNew ZealandPeruRomaniaSerbiaSingaporeSouth KoreaSwedenUkraine
Unlock Eligibility Criteria

Recent Changes (Last 90 Days)

LOWSep 24, 2026NCT06094010lastUpdatePostDate: changed
LOWSep 24, 2026NCT06094010lastUpdatePostDate: changed
LOWSep 19, 2026NCT07827599NEW_TRIAL: changed
LOWSep 19, 2026NCT07827599NEW_TRIAL: changed
LOWSep 19, 2026NCT07827599NEW_TRIAL: changed

Frequently asked questions about Baloxavir Marboxil

What is Baloxavir Marboxil used for?

Baloxavir Marboxil is used for the treatment and prevention of influenza, including influenza in humans and post-exposure prophylaxis. It is an infectious disease therapy developed by Roche Holding AG. Clinical development has focused on influenza A and B, including studies in pediatric and adult populations and in household transmission settings.

What does Baloxavir Marboxil target?

Baloxavir Marboxil targets the influenza virus PA subunit, a component of the viral polymerase complex. By acting on this target, it interferes with viral replication. This mechanism underlies its activity against influenza A and B viruses and supports its use in treatment and prophylaxis studies.

Who makes Baloxavir Marboxil?

Baloxavir Marboxil is developed by Roche Holding AG, which trades under the ticker RHHBY. Roche is the sponsor of the clinical program evaluating the drug in influenza, including treatment, pediatric, and post-exposure prophylaxis studies.

What phase is Baloxavir Marboxil in?

Baloxavir Marboxil is in Phase 3 clinical development for influenza. It is an investigational small molecule and is not described as approved in the available program information. The Phase 3 program includes completed and ongoing trials across multiple countries and age groups.

What clinical trials is Baloxavir Marboxil in?

Baloxavir Marboxil has been studied in six Phase 3 trials, including NCT03969212, a completed household transmission study, and NCT06094010, a recruiting pediatric surveillance study. Other trials include NCT06774859 in Chinese pediatric participants and NCT07827599, a post-exposure prophylaxis study not yet recruiting.

How many patients have been enrolled in Baloxavir Marboxil trials?

Across the six Phase 3 trials, total enrollment is 5,923 participants. The largest study, NCT03969212, enrolled 4,138 participants to assess reduction of onward influenza transmission in households. Trials have included randomized, double-blind, placebo-controlled designs and participants from multiple countries.