Yes, Xofluza Is a Single-Dose Treatment
Xofluza (baloxavir marboxil) is approved by the FDA for treating acute uncomplicated influenza in people 5 years and older who have been symptomatic for no more than 48 hours. The standard regimen is a one-time oral suspension or tablet, typically 40 mg or 80 mg based on body weight (≤80 kg or >80 kg). This single-dose approach sets it apart from multi-day antivirals like Tamiflu.[1][2]
How and When to Take the Single Dose
Take it as soon as possible after flu symptoms start, ideally within 48 hours, with or without food. For the oral suspension, mix it with a sweetened liquid like chocolate syrup right before use—don't prepare it ahead. The tablet form is swallowed whole. No repeat doses are needed for standard treatment.[1][3]
Who Qualifies for Single-Dose Xofluza
It's for otherwise healthy patients 5+ years old with uncomplicated flu. For high-risk patients (e.g., those with asthma or diabetes), a single dose plus supportive care is still the protocol, but consult a doctor for specifics. Not approved for kids under 5 or hospitalized flu cases.[1][2]
Single Dose for Post-Exposure Prevention
Xofluza also works as a one-time prophylactic dose for preventing flu after exposure in people 5+ years old. Given within 72 hours of contact with a confirmed case, it's 40 mg or 80 mg by weight—no follow-up doses required.[1][4]
What If You Miss the Timing or Need More?
Effectiveness drops after 48 hours of symptoms, so it's not recommended then. If symptoms persist or worsen post-dose, seek medical help—it's not for bacterial infections or complications. No adjustments for mild kidney/liver issues, but avoid in severe cases.[1][3]
How Xofluza's Single Dose Compares to Tamiflu
Unlike Tamiflu (oseltamivir), which requires twice-daily dosing for 5 days, Xofluza finishes in one dose, improving adherence. Studies show similar flu symptom reduction, but Xofluza acts faster on viral load. Tamiflu is cheaper as generic and approved for younger kids.[2][5]
[1]: FDA Label for Xofluza
[2]: CDC Influenza Antiviral Medications
[3]: Xofluza Prescribing Information - Genentech
[4]: FDA Approval Summary
[5]: NEJM Study on Baloxavir vs Oseltamivir