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XOFLUZA™
(baloxavir marboxil) Tablets
XOFLUZA (baloxavir marboxil) is an antiviral PA endonuclease inhibitor. XOFLUZA is supplied as white to light yellow film-coated tablets for oral administration.
The active component of XOFLUZA is baloxavir marboxil. Baloxavir marboxil has a molecular weight of 571.55 and a partition coefficient (log P) of 2.26. It is freely soluble in dimethylsulfoxide, soluble in acetonitrile, slightly soluble in methanol and ethanol and practically insoluble in water.
The chemical name of baloxavir marboxil is ({(12aR)-12-[(11S)-7,8-Difluoro-6,11-dihydrodibenzo[b,e]thiepin- 11-yl]-6,8-dioxo-3,4,6,8,12,12a-hexahydro-1H-[1,4]oxazino[3,4-c]pyrido[2,1-f][1,2,4]triazin-7-yl}oxy)methyl methyl carbonate. The empirical formula of baloxavir marboxil is C27H23F2N3O7S and the chemical structure is shown below.
 |
The inactive ingredients of XOFLUZA are: croscarmellose sodium, hypromellose, lactose monohydrate, microcrystalline cellulose, povidone, sodium stearyl fumarate, talc, and titanium dioxide.
XOFLUZA™ is indicated for the treatment of acute uncomplicated influenza in patients 12 years of age and older who have been symptomatic for no more than 48 hours.
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 [see Microbiology and Clinical Studies].
Initiate treatment with XOFLUZA within 48 hours of influenza symptom onset. XOFLUZA is taken orally as a single dose and may be taken with or without food. However, co-administration of XOFLUZA with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc) should be avoided [see DRUG INTERACTIONS, CLINICAL PHARMACOLOGY].
The recommended dose of XOFLUZA in patients 12 years of age or older with acute uncomplicated influenza is a single weight-based dose as follows:
Table 1 : Recommended XOFLUZA Dosage in Adults and
Adolescents 12 Years and Older
| Patient Body Weight (kg) | Recommended Oral Dose |
| 40 kg to less than 80 kg | Single Dose of 40 mg |
| At least 80 kg | Single Dose of 80 mg |
XOFLUZA 20 mg Tablets are white to light yellow, oblong shaped film-coated tablets debossed with “772” on one side and “20” on the other side.
XOFLUZA 40 mg Tablets are white to light yellow, oblong shaped film-coated tablets debossed with “BXM40” on one side.
2 x 20 mg tablets per blister card in secondary packaging: NDC 50242-828-02
4 x 20 mg tablets per blister card in secondary packaging: NDC 50242-828-04
1 x 40 mg tablet per blister card in secondary packaging: NDC 50242-860-01
2 x 40 mg tablets per blister card in secondary packaging: NDC 50242-860-02
Store XOFLUZA in its blister package at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature].
Distributed by: Genentech USA, Inc., A Member of the Roche Group, 1 DNA Way, South San Francisco, CA 94080-4990. Manufactured by: Shionogi & Co., Ltd., 2-5-1 Mishima, Settsu, Osaka 566-0022, Japan. Revised: Oct 2018
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
The safety profile of XOFLUZA is based on data from 2 placebo-controlled trials, in which a total of 910 subjects received XOFLUZA: 834 (92%) were adults (18 years and older) and 76 (8%) were adolescents (12 to less than 18 years). Of these, 710 subjects received XOFLUZA at the recommended dose. In Trial 1, adult subjects 20 to 64 years of age received a single oral dose of XOFLUZA or placebo. In Trial 2, adult subjects 20 to 64 years of age received XOFLUZA, placebo as a single oral dose on Day 1, or oseltamivir twice a day for 5 days, and adolescent subjects 12 to less than 20 years of age received XOFLUZA or placebo as a single oral dose.
Table 2 displays the most common adverse events (regardless of causality assessment) reported in at least 1% of adult and adolescent subjects who received XOFLUZA at the recommended dose in Trials 1 and 2.
Table 2 : Incidence of Adverse Events Occurring in
Greater Than or Equal to 1% of Subjects Receiving XOFLUZA in the Acute
Uncomplicated Influenza Trials
| Adverse Event | XOFLUZA (N = 710) |
Placebo (N = 409) |
| Diarrhea | 3% | 5% |
| Bronchitis | 2% | 4% |
| Nausea | 1% | 1% |
| Nasopharyngitis | 1% | 1% |
| Headache | 1% | 2% |
Co-administration with polyvalent cation-containing products may decrease plasma concentrations of baloxavir which may reduce XOFLUZA efficacy. Avoid co-administration of XOFLUZA with polyvalent cationcontaining laxatives, antacids, or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc).
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.
Included as part of the PRECAUTIONS section.
There is no evidence of efficacy of XOFLUZA in any illness caused by pathogens other than influenza viruses. Serious bacterial infections may begin with influenza-like symptoms, 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.
Advise the patient to read the FDA-approved patient labeling (PATIENT INFORMATION).
Instruct patients to begin treatment with XOFLUZA as soon as possible at the first appearance of influenza symptoms, within 48 hours of onset of symptoms. XOFLUZA can be taken with or without food, but advise patients not to take with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc) [see DOSAGE AND ADMINISTRATION and DRUG INTERACTIONS].
Because of the potential for antivirals to decrease the effectiveness of live attenuated influenza vaccine, advise patients to consult their healthcare provider prior to receiving a live attenuated influenza vaccine after taking XOFLUZA [see DRUG INTERACTIONS].
Carcinogenicity studies have not been performed with baloxavir marboxil.
Baloxavir marboxil and the active metabolite, baloxavir, were not mutagenic in in vitro and in in vivo genotoxicity assays which included bacterial mutation assays in S. typhimurium and E. coli, micronucleus tests with cultured mammalian cells, and in the rodent micronucleus assay.
In a fertility and early embryonic development study in rats, doses of baloxavir marboxil at 20, 200, or 1,000 mg/kg/day were administered to females for 2 weeks before mating, during mating and until day 7 of pregnancy. Males were dosed for 4 weeks before mating and throughout mating. There were no effects on fertility, mating performance, or early embryonic development at any dose level, resulting in systemic drug exposure (AUC) approximately 5 times the MRHD.
There are no available data on XOFLUZA use in pregnant women to inform a drug-associated risk of adverse developmental outcomes. There are risks to the mother and fetus associated with influenza virus infection in pregnancy (see Clinical Considerations). In animal reproduction studies, no adverse developmental effects were observed in rats or rabbits with oral administration of baloxavir marboxil at exposures approximately 5 (rats) and 7 (rabbits) times the systemic baloxavir exposure at the maximum recommended human dose (MRHD) (see Data).
The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defects, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.
Disease-Associated Maternal And/Or Embryo/Fetal Risk
Pregnant women are at higher risk of severe complications from influenza, which may lead to adverse pregnancy and/or fetal outcomes including maternal death, stillbirth, birth defects, preterm delivery, low birth weight and small for gestational age.
Animal Data
Baloxavir marboxil was administered orally to pregnant rats (20, 200, or 1,000 mg/kg/day from gestation day 6 to 17) and rabbits (30, 100, or 1,000 mg/kg/day from gestation day 7 to 19). No adverse embryo-fetal effects were observed in rats up to the highest dose of baloxavir marboxil (1,000 mg/kg/day), resulting in systemic baloxavir exposure (AUC) of approximately 5 times the exposure at the MRHD. In rabbits, fetal skeletal variations occurred at a maternally toxic dose (1,000 mg/kg/day) resulting in 2 abortions out of 19 pregnancies. No adverse maternal or embryo-fetal effects were observed in rabbits at the middle dose (100 mg/kg/day) resulting in systemic baloxavir exposure (AUC) approximately 7 times the exposure at the MRHD.
In the prenatal and postnatal development study in rats, baloxavir marboxil was administered orally at 20, 200, or 1,000 mg/kg/day from gestation day 6 to postpartum/lactation day 20. No significant effects were observed in the offspring at maternal systemic baloxavir exposure (AUC) approximately 5 times the exposure at the MRHD.
There are no data on the presence of baloxavir marboxil in human milk, the effects on the breastfed infant, or the effects on milk production. Baloxavir and its related metabolites were present in the milk of lactating rats (see Data). The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for XOFLUZA and any potential adverse effects on the breastfed child from the drug or from the underlying maternal condition.
In a lactation study, baloxavir and its related metabolites were excreted in the milk of lactating rats administered baloxavir marboxil (1 mg/kg) on postpartum/lactation day 11, with peak milk concentration approximately 5 times that of maternal plasma concentrations occurring 2 hours post-dose. No effects of baloxavir marboxil on growth and postnatal development were observed in nursing pups at the highest oral dose tested in rats. Maternal systemic exposure was approximately 5 times the baloxavir exposure in humans at the MRHD.
The safety and effectiveness of XOFLUZA for the treatment of influenza have been established in pediatric patients 12 years of age and older weighing at least 40 kg [see ADVERSE REACTIONS and Clinical Studies]. The safety and effectiveness of XOFLUZA have not been established in pediatric patients less than 12 years of age.
The use of XOFLUZA in pediatric patients 12 years of age and older weighing at least 40 kg is supported by one randomized, double-blind, controlled trial [see Clinical Studies]. In this phase 3 trial, 118 adolescents were randomized to receive either XOFLUZA (N=80) or placebo (N=38). The median time to alleviation of symptoms in adolescent subjects was 54 hours compared to 93 hours for subjects who received placebo. Â Adverse reactions reported in adolescents were similar to those reported in adults [see ADVERSE REACTIONS].
Clinical trials of XOFLUZA did not include subjects 65 years of age and older to determine whether they respond differently from younger subjects.
There have been no reports of XOFLUZA overdoses. Treatment of an overdose of XOFLUZA should consist of general supportive measures including monitoring of vital signs and observation of the clinical status of the patient. There is no specific antidote for overdose with XOFLUZA.
Baloxavir is unlikely to be significantly removed by dialysis due to high serum protein binding [see CLINICAL PHARMACOLOGY].
XOFLUZA is contraindicated in patients with a history of hypersensitivity to baloxavir marboxil or any of its ingredients.
Baloxavir marboxil is an antiviral drug with activity against influenza virus [see Microbiology].
At twice the expected exposure from recommended dosing, XOFLUZA did not prolong the QTc interval.
No change in the baloxavir exposure-response (time to alleviation of symptoms) relationship was observed at the recommended dosing.
Baloxavir marboxil is a prodrug that is almost completely converted to its active metabolite, baloxavir, following oral administration.
In the phase 3 trial, at the recommended dose of 40 mg for subjects weighing less than 80 kg, the mean (CV%) values of baloxavir Cmax and AUC0-inf were 96.4 ng/mL (45.9%) and 6160 ng·hr/mL (39.2%), respectively. At the recommended dose of 80 mg for subjects weighing 80 kg and more, the mean (CV%) values of baloxavir Cmax and AUC0-inf were 107 ng/mL (47.2%) and 8009 ng·hr/mL (42.4%), respectively. Refer to Table 3 for pharmacokinetic parameters of baloxavir in healthy subjects.
Table 3 : Pharmacokinetic Parameters of Plasma
Baloxavir
| Absorption | |
| Tmax (hr)a | 4 |
| Effect of food (relative to fasting)b | Cmax: ↓48%, AUC0-inf; ↓36% |
| Distribution | |
| % Bound to human serum proteinsc | 92.9 - 93.9 |
| Ratio of blood cell to blood | 48.5% - 54.4% |
| Volume of distribution (V/F, L)d | 1180 (20.8%) |
| Elimination | |
| Major route of elimination | Metabolism |
| Clearance (CL/F, L/hr)d | 10.3 (22.5%) |
| t½ (hr) d e | 79.1 (22.4%) |
| Metabolism | |
| Metabolic pathwaysf | UGT1A3, CYP3A4 |
| Excretion | |
| % of dose excreted in urineg | 14.7 (Total radioactivity), 3.3 (Baloxavir) |
| % of dose excreted in fecesg | 80.1 (Total radioactivity) |
| a Median b Meal: approximately 400 to 500 kcal including 150 kcal from fat c in vitro d Geometric mean (geometric CV%) e Apparent terminal elimination half-life f Baloxavir is primarily metabolized by UGT1A3 with minor contribution from CYP3A4 g Ratio of radioactivity to radio-labeled [14C]-baloxavir marboxil dose in mass balance study |
|
There were no clinically significant differences in the pharmacokinetics of baloxavir based on age (adolescents as compared to adults), or sex.
A population pharmacokinetic analysis did not identify a clinically meaningful effect of renal function on the pharmacokinetics of baloxavir in patients with creatinine clearance (CrCl) 50 mL/min and above. The effects of severe renal impairment on the pharmacokinetics of baloxavir marboxil or its active metabolite, baloxavir, have not been evaluated.
In a clinical study comparing pharmacokinetics of baloxavir in subjects with moderate hepatic impairment (Child-Pugh class B) to subjects with normal hepatic function, no clinically meaningful differences in the pharmacokinetics of baloxavir were observed.
The pharmacokinetics in patients with severe hepatic impairment have not been evaluated.
Body weight had a significant effect on the pharmacokinetics of baloxavir (as body weight increases, baloxavir exposure decreases). When dosed with the recommended weight-based dosing, no clinically significant difference in exposure was observed between body weight groups.
Based on a population pharmacokinetic analysis, baloxavir exposure is approximately 35% lower in non- Asians as compared to Asians; this difference is not considered clinically significant when the recommended dose was administered.
No clinically significant changes in the pharmacokinetics of baloxavir marboxil and its active metabolite, baloxavir, were observed when co-administered with itraconazole (combined strong CYP3A and P-gp inhibitor), probenecid (UGT inhibitor), or oseltamivir.
No clinically significant changes in the pharmacokinetics of the following drugs were observed when coadministered with baloxavir marboxil: midazolam (CYP3A4 substrate), digoxin (P-gp substrate), rosuvastatin (BCRP substrate), or oseltamivir.
Clinically Cytochrome P450 (CYP) Enzymes
Baloxavir marboxil and its active metabolite, baloxavir, did not inhibit CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, or CYP2D6. Baloxavir marboxil and its active metabolite, baloxavir, did not induce CYP1A2, CYP2B6, or CYP3A4.
Uridine Diphosphate (UDP)-Glucuronosyl Transferase (UGT) Enzymes
Baloxavir marboxil and its active metabolite, baloxavir, did not inhibit UGT1A1, UGT1A3, UGT1A4, UGT1A6, UGT1A9, UGT2B7, or UGT2B15.
Transporter Systems
Both baloxavir marboxil and baloxavir are substrates of P-glycoprotein (P-gp). Baloxavir did not inhibit organic anion transporting polypeptides (OATP) 1B1, OATP1B3, organic cation transporter (OCT) 1, OCT2, organic anion transporter (OAT) 1, OAT3, multidrug and toxin extrusion (MATE) 1, or MATE2K.
Potential For Interactions With Polyvalent Cations
Baloxavir may form a chelate with polyvalent cations such as calcium, aluminum, or magnesium in food or medications. A significant decrease in baloxavir exposure was observed when XOFLUZA was co-administered with calcium, aluminum, magnesium, or iron in monkeys. No study has been conducted in humans.
Baloxavir marboxil is a prodrug that is converted by hydrolysis to baloxavir, the active form that exerts antiinfluenza virus activity. Baloxavir inhibits the endonuclease activity of the polymerase acidic (PA) protein, an influenza virus-specific enzyme in the viral RNA polymerase complex required for viral gene transcription, resulting in inhibition of influenza virus replication. The 50% inhibitory concentration (IC50) of baloxavir was 1.4 to 3.1 nM (n=4) for influenza A viruses and 4.5 to 8.9 nM (n=3) for influenza B viruses in a PA endonuclease assay. Viruses with reduced susceptibility to baloxavir have amino acid substitutions in the PA protein.
The antiviral activity of baloxavir against laboratory strains and clinical isolates of influenza A and B viruses was determined in an MDCK-cell-based plaque reduction assay. The median 50% effective concentration (EC50) values of baloxavir were 0.73 nM (n=19; range: 0.20-1.85 nM) for subtype A/H1N1 strains, 0.68 nM (n=19; range: 0.35-1.87 nM) for subtype A/H3N2 strains, and 5.28 nM (n=21; range: 3.33-13.00 nM) for type B strains. In an MDCK-cell-based virus titer reduction assay, the 90% effective concentration (EC90) values of baloxavir against avian subtypes A/H5N1 and A/H7N9 were 1.64 and 0.80 nM, respectively. The relationship between antiviral activity in cell culture and clinical response to treatment in humans has not been established.
Cell culture: Influenza A virus isolates with reduced susceptibility to baloxavir were selected by serial passage of virus in cell culture in the presence of increasing concentrations of baloxavir. Reduced susceptibility of influenza A virus to baloxavir was conferred by amino acid substitutions I38T (A/H1N1 and A/H3N2) and E199G (A/H3N2) in the PA protein of the viral RNA polymerase complex.
Clinical Studies
Influenza A and B viruses with treatment-emergent amino acid substitutions at positions associated with reduced susceptibility to baloxavir in cell culture were observed in clinical studies (Table 4). The overall incidence of treatment-emergent amino acid substitutions associated with reduced susceptibility to baloxavir in Trials 1 and 2 was 2.7% (5/182) and 11% (39/370), respectively.
Table 4 : Treatment-Emergent Amino Acid Substitutions
in PA Associated with Reduced Susceptibility to Baloxavir
| Influenza Type/Subtype | A/H1N1 | A/H3N2 | B |
| Amino Acid Substitution | E23K/R, I38F/T | E23G/K, A37T, I38M/T, E199G | I38T |
None of the treatment-emergent substitutions associated with reduced susceptibility to baloxavir were identified in virus from pre-treatment respiratory specimens in the clinical studies. Strains containing substitutions known to be associated with reduced susceptibility to baloxavir were identified in approximately 0.05% of PA sequences in the National Center for Biotechnology Information/GenBank database (queried August 2018).
Prescribers should consider currently available surveillance information on influenza virus drug susceptibility patterns and treatment effects when deciding whether to use XOFLUZA.
Cross-resistance between baloxavir and neuraminidase (NA) inhibitors, or between baloxavir and M2 proton pump inhibitors (adamantanes), is not expected, because these drugs target different viral proteins. Baloxavir is active against NA inhibitor-resistant strains, including A/H1N1 and A/H5N1 viruses with the NA substitution H275Y (A/H1N1 numbering), A/H3N2 virus with the NA substitution E119V, A/H7N9 virus with the NA substitution R292K (A/H3N2 numbering), and type B virus with the NA substitution D198E (A/H3N2 numbering). The NA inhibitor oseltamivir is active against viruses with reduced susceptibility to baloxavir, including A/H1N1 virus with PA substitutions E23K or I38F/T, A/H3N2 virus with PA substitutions E23G/K, A37T, I38M/T, or E199G, and type B virus with the PA substitution I38T. Influenza virus may carry amino acid substitutions in PA that reduce susceptibility to baloxavir and at the same time carry resistance-associated substitutions for NA inhibitors and M2 proton pump inhibitors. The clinical relevance of phenotypic crossresistance evaluations has not been established.
Interaction studies with influenza vaccines and baloxavir marboxil have not been conducted.
Two randomized controlled double-blinded clinical trials conducted in two different influenza seasons evaluated efficacy and safety of XOFLUZA in otherwise healthy subjects with acute uncomplicated influenza.
In Trial 1, a placebo-controlled phase 2 dose-finding trial, a single oral dose of XOFLUZA was compared with placebo in 400 adult subjects 20 to 64 years of age in Japan. All subjects in Trial 1 were Asian, the majority of subjects were male (62%), and the mean age was 38 years. In this trial, among subjects who received XOFLUZA and had influenza virus typed, influenza A/H1N1 was the predominant strain (63%), followed by influenza B (25%), and influenza A/H3N2 (12%).
In Trial 2 (NCT02954354), a phase 3 active- and placebo-controlled trial, XOFLUZA was studied in 1,436 adult and adolescent subjects 12 to 64 years of age weighing at least 40 kg in the U.S. and Japan. Adults ages 20 to 64 years received XOFLUZA or placebo as a single oral dose on Day 1 or oseltamivir twice a day for 5 days. Subjects in the XOFLUZA and placebo arms received a placebo for the duration of oseltamivir dosing after XOFLUZA or placebo dosing in that arm. Adolescent subjects 12 to less than 20 years of age received XOFLUZA or placebo as a single oral dose.
In Trial 2, subjects weighing less than 80 kg received XOFLUZA at a dose of 40 mg and subjects weighing 80 kg or more received an 80 mg dose. Seventy-eight percent of subjects in Trial 2 were Asian, 17% were White, and 4% were Black or African American. The mean age was 34 years, and 11% of subjects were less than 20 years of age; 54% of subjects were male and 46% female. In Trial 2, among subjects who received XOFLUZA and had influenza virus typed, influenza A/H3N2 was the predominant strain (90%), followed by influenza B (9%), and influenza A/H1N1 (2%).
In both trials, eligible subjects had an axillary temperature of at least 38 °C, at least one moderate or severe respiratory symptom (cough, nasal congestion, or sore throat), and at least one moderate or severe systemic symptom (headache, feverishness or chills, muscle or joint pain, or fatigue) and all were treated within 48 hours of symptom onset. Subjects participating in the trial were required to self-assess their influenza symptoms as “none”, “mild”, “moderate” or “severe” twice daily. The primary efficacy population was defined as those with a positive rapid influenza diagnostic test (Trial 1) or positive influenza RT-PCR (Trial 2) at trial entry.
The primary endpoint of both trials, time to alleviation of symptoms, was defined as the time when all seven symptoms (cough, sore throat, nasal congestion, headache, feverishness, myalgia, and fatigue) had been assessed by the subject as none or mild for a duration of at least 21.5 hours.
In both trials, XOFLUZA treatment at the recommended dose resulted in a statistically significant shorter time to alleviation of symptoms compared with placebo in the primary efficacy population (Tables 5 and 6).
Table 5 : Time to Alleviation of Symptoms after Single
Dose in Adult Subjects with Acute Uncomplicated Influenza in Trial 1 (Median
Hours)
| XOFLUZA 40 mg (95% CI1) N = 100 |
Placebo (95% CI1) N = 100 |
|
| Adults (20 to 64 Years of Age) | 50 hours2 (45, 64) |
78 hours (68, 89) |
| 1CI: Confidence interval 2XOFLUZA treatment resulted in a statistically significant shorter time to alleviation of symptoms compared to placebo using the Gehan-Breslow’s generalized Wilcoxon test (p-value: 0.014, adjusted for multiplicity). The primary analysis using the Cox Proportional Hazards Model did not reach statistical significance (p-value: 0.165). |
||
Table 6 : Time to Alleviation of Symptoms after Single
Dose in Subjects 12 Years of Age and Older with Acute Uncomplicated Influenza
in Trial 2 (Median Hours)
| XOFLUZA 40 mg or 80 mg1 (95% CI2) N = 455 |
Placebo (95% CI2) N = 230 |
|
| Subjects (≥ 12 Years of Age) | 54 hours3 (50, 59) | 80 hours (73, 87) |
| 1Dosing was based on weight. Subjects weighing
< 80 kg received a single 40 mg dose and subjects ≥ 80 kg received a
single 80 mg dose. 2CI: Confidence interval 3XOFLUZA treatment resulted in a statistically significant shorter time to alleviation of symptoms compared to placebo using the Peto-Prentice’s generalized Wilcoxon test (p-value: <0.001). |
||
In Trial 2, there was no difference in the time to alleviation of symptoms between subjects who received XOFLUZA (54 hours) and those who received oseltamivir (54 hours). For adolescent subjects (12 to 17 years of age) in Trial 2, the median time to alleviation of symptoms for subjects who received XOFLUZA (N=63) was 54 hours (95% CI of 43, 81) compared to 93 hours (95% CI of 64, 118) in the placebo arm (N=27).
The number of subjects who received XOFLUZA at the recommended dose and who were infected with influenza type B virus was limited, including 24 subjects in Trial 1 and 38 subjects in Trial 2. In the influenza B subset in Trial 1, the median time to alleviation of symptoms in subjects who received 40 mg XOFLUZA was 63 hours (95% CI of 43, 70) compared to 83 hours (95% CI of 58, 93) in subjects who received placebo. In the influenza B subset in Trial 2, the median time to alleviation of symptoms in subjects who received 40 mg or 80 mg XOFLUZA was 93 hours (95% CI of 53, 135) compared to 77 hours (95% CI of 47, 189) in subjects who received placebo.
XOFLUZA™
(zoh-FLEW-zuh)
(baloxavir marboxil) tablets
What is XOFLUZA?
XOFLUZA is a prescription medicine used to treat the flu (influenza) in people 12 years of age and older who have had flu symptoms for no more than 48 hours.
It is not known if XOFLUZA is safe and effective in children less than 12 years of age or weighing less than 88 pounds (40 kg).
Do not take XOFLUZA if you are allergic to baloxavir marboxil or any of the ingredients in XOFLUZA.
See the end of this leaflet for a complete list of ingredients in XOFLUZA.
Before you take XOFLUZA, tell your healthcare provider about all of your medical conditions, including if you:
Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.
Talk to your healthcare provider before you receive a live flu vaccine after taking XOFLUZA.
How should I take XOFLUZA?
What are the possible side effects of XOFLUZA?
The most common side effects of XOFLUZA in adults and adolescents include:
XOFLUZA is not effective in treating infections other than influenza. Other kinds of infections can appear like flu or occur along with flu and may need different kinds of treatment. Tell your healthcare provider if you feel worse or develop new symptoms during or after treatment with XOFLUZA or if your flu symptoms do not start to get better.
These are not all the possible side effects of XOFLUZA.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800 FDA-1088.
How should I store XOFLUZA?
Keep XOFLUZA and all medicines out of the reach of children.
General information about the safe and effective use of XOFLUZA.
Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use XOFLUZA for a condition for which it was not prescribed. Do not give XOFLUZA to other people, even if they have the same symptoms that you have. It may harm them. You can ask for information about XOFLUZA that is written for health professionals.
What are the ingredients in XOFLUZA?
Active ingredient: baloxavir marboxil
Inactive ingredients: croscarmellose sodium, hypromellose, lactose monohydrate, microcrystalline cellulose, povidone, sodium stearyl fumarate, talc, and titanium dioxide.
This Patient Information has been approved by the U.S. Food and Drug Administration.
