For Patients and Caregivers

Single-Dose XOFLUZA Has a Generally Well-Tolerated Safety Profile1

Single-dose XOFLUZA had a similar adverse event (AE) rate as placebo—including in patients aged ≥12 years at high risk of developing complications from the flu.1

The below table shows AEs in Trials T0821, T0831, and T0832 that occurred in at least 1% of patients (aged ≥12 years) with acute uncomplicated influenza receiving either XOFLUZA or placebo.1*

Adverse

Event		 XOFLUZA

(n=1440)		 Placebo

(n=1136)
Diarrhea 3% 4%
Bronchitis 3% 4%
Nausea 2% 3%
Sinusitis 2% 3%
Headache 1% 1%

*Based on combined data from 3 trials, a total of 1640 subjects received XOFLUZA: 1334 (81%) were adults (18-64 years of age), 209 (13%) were adults 65 years of age or older, and 97 (6%) were adolescents (12-17 years of age). Of these, 1440 subjects received XOFLUZA at the recommended dose.1

The below table shows the most frequently reported AEs in Trial CP40563 that occurred in ≥5% of patients (aged 5 to <12 years) with acute uncomplicated influenza in the XOFLUZA arm.1

Adverse

Event		 XOFLUZA
(n=79)
Vomiting 5%
Diarrhea 5%

There are limited safety data in patients 5 to <12 years at high risk of developing influenza complications.

Trial CP40563 was a randomized, double-blind, multicenter, active-controlled study designed to evaluate the safety, efficacy, and pharmacokinetics of a single oral dose of XOFLUZA compared with oseltamivir in pediatric subjects (including subjects aged 5 to <12 years) with influenza-like symptoms. A total of 118 subjects aged 5 to <12 years were randomized and received a single one-time oral dose of XOFLUZA (n=79) based on body weight (2 mg/kg for subjects weighing <20 kg or 40 mg for subjects weighing ≥20 kg) or oseltamivir (n=39) for 5 days (dose based on body weight). Of the 118 subjects 5 to <12 years of age in Trial CP40563, 15 subjects in the XOFLUZA arm and 4 subjects in the oseltamivir arm were at high risk of developing influenza complications. The primary objective was to compare the safety of a single one-time dose of XOFLUZA with 5 days of oseltamivir administered twice daily. Vomiting was reported in 18% of subjects in the oseltamivir arm.1

A Single-Dose Flu Antiviral Rx for Post-Exposure Prophylaxis1

No serious treatment-related adverse events were reported.2

The safety profile of XOFLUZA was similar in patients aged 5 to <12 years and in patients aged 12 years and older.1

Icon of shield. See Safety Profile of XOFLUZA

Studied in household members exposed to the flu

Single-dose XOFLUZA helps protect people who’ve been exposed to the flu by reducing their risk of infection.1

Trial T0834 was a phase 3, randomized, double-blind, multicenter, placebo-controlled trial designed to evaluate the efficacy of a single oral dose of XOFLUZA compared with placebo in the prevention of influenza in subjects who were household contacts of influenza-infected patients in Japan. Influenza-infected index patients were required to have onset of symptoms for ≤48 hours, and subjects (household contacts) were required to have lived with the influenza-infected index patient for ≥48 hours. A total of 715 subjects (XOFLUZA n=360, placebo n=355) aged 5 years and older were randomized and received a single oral dose of XOFLUZA according to body weight and age, or placebo, on Day 1. Subjects received a single dose of 40 mg or 80 mg of XOFLUZA according to body weight (20 kg to <80 kg or ≥80 kg, respectively). The primary efficacy endpoint was the proportion of household subjects who were infected with influenza virus and presented with fever and at least one respiratory symptom from Day 1 to Day 10. Influenza infection was confirmed by RT-PCR, fever was defined as a body temperature (axillary) ≥37.5°C, and respiratory symptoms were defined as having a symptom of “cough” or “nasal discharge/nasal congestion” with a severity of moderate or severe as assessed by the subject. In subjects that were 5 years of age and older, there was a statistically significant reduction in the proportion of household contacts (subjects) with laboratory-confirmed clinical influenza from 13% in the placebo group to 2% in the XOFLUZA group.1

XOFLUZA® (baloxavir marboxil) Clipboard Icon
Treats the Flu

See the clinical efficacy for single-dose XOFLUZA.1

Find out more
XOFLUZA® (baloxavir marboxil) Stop Replication Icon
Stops Viral Replication

Single-dose XOFLUZA stops the flu virus from replicating by targeting the flu at its source.1

XOFLUZA MOA

Frequently
asked
questions

XOFLUZA can be taken with or without food.1


Avoid coadministration of XOFLUZA with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids, or oral supplements (eg, calcium, iron, magnesium, selenium, or zinc).1


The concurrent use of XOFLUZA with intranasal live attenuated influenza vaccine (LAIV) has not been evaluated. Concurrent administration of antiviral drugs may inhibit viral replication of LAIV and thereby decrease the effectiveness of LAIV vaccination. Interactions between inactivated influenza vaccines and XOFLUZA have not been evaluated.1

XOFLUZA is contraindicated in patients with a history of hypersensitivity to baloxavir marboxil or any of its ingredients.1


Serious allergic reactions have included anaphylaxis, angioedema, urticaria, and erythema multiforme. Cases of anaphylaxis, urticaria, angioedema, and erythema multiforme have been reported in postmarketing experience with XOFLUZA. Appropriate treatment should be instituted if an allergic-like reaction occurs or is suspected. The use of XOFLUZA is contraindicated in patients with known hypersensitivity to XOFLUZA. You should review the full Prescribing Information for warnings and precautions before prescribing.1

Data on XOFLUZA use in pregnancy are limited. There are no adequate and well-controlled studies with XOFLUZA in pregnant women to inform a drug-associated risk of adverse developmental outcomes.1

There are risks to the mother and fetus associated with influenza virus infection in pregnancy. Treatment decisions in pregnant patients should weigh the potential benefits and risks, disease severity, and patient risk factors, together with the current Prescribing Information and guidance from the Centers for Disease Control and Prevention (CDC), the American College of Obstetricians and Gynecologists (ACOG), or local public health authorities.

In clinical trials, the incidence of virus with treatment-emergent substitutions associated with reduced susceptibility to baloxavir (resistance) was 16% (19/117) in subjects ≥5 years to <12 years of age, and 7% (60/842) in subjects ≥12 years of age.1

Because of this, you should consider resistance, adherence/administration issues, reinfection, complications, or alternative diagnoses if a patient has persistent or worsening symptoms after antiviral therapy. Follow CDC surveillance updates, local susceptibility information when available, and the Prescribing Information.

Limitations of Use:
Influenza viruses change over time, and factors such as the virus type or subtype, emergence of resistance, or changes in viral virulence could diminish the clinical benefit of antiviral drugs. Consider available information on drug susceptibility patterns for circulating influenza virus strains when deciding whether to use XOFLUZA.

IMPORTANT SAFETY INFORMATION & INDICATION

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.
  • Post-exposure prophylaxis (PEP) of influenza in patients 5 years of age and older following contact with an individual who has influenza.

Limitations of Use
Influenza viruses change over time, and factors such as the virus type or subtype, emergence of resistance, or changes in viral virulence could diminish the clinical benefit of antiviral drugs. Consider available information on drug susceptibility patterns for circulating influenza virus strains when deciding whether to use XOFLUZA.

Important Safety Information

Contraindications
XOFLUZA is contraindicated in patients with a history of hypersensitivity to baloxavir marboxil or any of its ingredients. Serious allergic reactions have included anaphylaxis, angioedema, urticaria, and erythema multiforme.

Warnings and Precautions

Hypersensitivity: Cases of anaphylaxis, urticaria, angioedema, and erythema multiforme have been reported in postmarketing experience with XOFLUZA. Appropriate treatment should be instituted if an allergic-like reaction occurs or is suspected.

Increased Incidence of Treatment-Emergent Resistance in Patients Less Than 5 Years of Age: XOFLUZA is not indicated in patients less than 5 years of age due to increased incidence of treatment-emergent resistance in this age group. In clinical trials, the incidence of virus with treatment-emergent substitutions associated with reduced susceptibility to baloxavir (resistance) was higher in pediatric subjects younger than 5 years of age (40%, 38/96) than in pediatric subjects ≥5 years to <12 years of age (16%, 19/117) or subjects ≥12 years of age (7%, 60/842). The potential for transmission of resistant strains in the community has not been determined.

Risk of bacterial infections: There is no evidence of the efficacy of XOFLUZA in any illness caused by pathogens other than influenza viruses. Serious bacterial infections may begin with influenza-like symptoms or may coexist with, or occur as, a complication of influenza. XOFLUZA has not been shown to prevent such complications. Prescribers should be alert to potential secondary bacterial infections and treat them as appropriate.

Adverse Reactions

  • The most common adverse reactions (≥1%) in adult and adolescent patients (≥12 years of age) in clinical studies for acute uncomplicated influenza were diarrhea (3%), bronchitis (3%), nausea (2%), sinusitis (2%), and headache (1%).
  • The most frequently reported adverse reactions (≥5%) in pediatric patients (5 to <12 years of age) in clinical studies for acute uncomplicated influenza were vomiting (5%) and diarrhea (5%).
  • The safety profile reported in a clinical study for post-exposure prophylaxis was similar in pediatric patients ages 5 to <12 years old as that reported in adults and adolescents 12 years of age and older.

Drug Interactions
Polyvalent cations: Coadministration with polyvalent cation-containing products may decrease plasma concentrations of baloxavir, which may reduce XOFLUZA efficacy. Avoid coadministration of XOFLUZA with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids, or oral supplements (eg, calcium, iron, magnesium, selenium, or zinc).

Vaccines: The concurrent use of XOFLUZA with intranasal live attenuated influenza vaccine (LAIV) has not been evaluated. Concurrent administration of antiviral drugs may inhibit viral replication of LAIV and, thereby, decrease the effectiveness of LAIV vaccination. Interactions between inactivated influenza vaccines and XOFLUZA have not been evaluated.

For additional Important Safety Information, please see the XOFLUZA full Prescribing Information.

You are encouraged to report side effects to Genentech by calling 1-888-835-2555 or to the FDA by visiting www.fda.gov/medwatch or calling 1-800-FDA-1088.

    • XOFLUZA. Prescribing information. Genentech, Inc.

      XOFLUZA. Prescribing information. Genentech, Inc.

    • Ikematsu H, Hayden FG, Kawaguchi K, et al. Baloxavir marboxil for prophylaxis against influenza in household contacts. N Engl J Med. 2020;383(4):309-320. doi:10.1056/NEJMoa1915341

      Ikematsu H, Hayden FG, Kawaguchi K, et al. Baloxavir marboxil for prophylaxis against influenza in household contacts. N Engl J Med. 2020;383(4):309-320. doi:10.1056/NEJMoa1915341

    +