Xofluza is an antiviral medication used to treat influenza in patients who have had symptoms for no more than 48 hours. It helps to reduce the duration of flu symptoms and its associated complications.
Active Ingredient: Baloxavir marboxil
Minimum Market Price: 0.1

Side Effects

Baloxavir marboxil usually has very few side effects. If you have any unusual effects, tell your doctor or pharmacist promptly.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US – Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada – Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

How long does it take for this medicine to take effect?

The onset of action for Xofluza is such that it begins to inhibit the influenza virus replication process soon after administration. Symptomatic relief may start to be noticed within 24 to 48 hours after taking the medication, as the viral load decreases. However, the timing of symptom improvement can vary from person to person.

How long do the effects of this medicine last?

Xofluza is administered as a single dose. Its antiviral effects contribute to the cessation of viral replication, which can help reduce the duration of flu symptoms. The duration of its antiviral effect persists as long as the drug remains active in the body, which is partly dependent on its half-life of approximately 80 hours (for its active form, baloxavir). This does not imply that the symptomatic relief lasts for the duration of the drug's presence in the body but that it plays a critical role in the overall reduction of the illness duration.

Is it safe to consume alcohol while taking this medicine?

There is no specific warning against alcohol consumption in the prescribing information for Xofluza. However, considering alcohol can potentially weaken the immune system and may exacerbate flu symptoms like dehydration, it's advisable to avoid or limit alcohol consumption while recovering from the flu.

Is this a habit forming medicine?

Xofluza is not habit-forming and has no potential for abuse or dependence. It is prescribed for a specific medical condition (influenza) and does not possess psychoactive properties that lead to habituation or addiction.

Can this medicine be taken during pregnancy?

Xofluza is classified as FDA Pregnancy Category B, indicating that animal studies have not shown harm to the fetus, but there are no adequate and well-controlled studies in pregnant women. Therefore, Xofluza should only be used during pregnancy if the potential benefit justifies the potential risk to the fetus. Pregnant women should consult with their healthcare provider before taking Xofluza.

Can this medicine be taken while breast-feeding?

There is limited data on the excretion of Xofluza in human milk, the effects on the breastfed child, or the effects on milk production. Due to the potential for serious adverse reactions in breastfeeding infants from Xofluza, a decision should be made whether to discontinue breastfeeding or to discontinue the drug, taking into account the importance of the drug to the mother.


Baloxavir marboxil is an antiviral medication used to treat the flu (influenza) if your symptoms started less than 48 hours ago. It helps make the symptoms (such as stuffy nose, cough, sore throat, fever/chills, aches, tiredness) less severe and may shorten the recovery time by 1 to 2 days. Baloxavir marboxil works by stopping the flu virus from growing. It will not treat other kinds of infection besides the flu virus.This medication may also be used to prevent the flu if you have been exposed to someone who already has the flu (such as a sick household member) or if there is a flu outbreak in the community. Talk to your doctor for more details.This medication should not be used in children younger than 5 since it may not be effective. Baloxavir marboxil is not a substitute for the flu vaccine.

How to use Xofluza

Read the Patient Information Leaflet if available from your pharmacist before you take baloxavir marboxil. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth with or without food as directed by your doctor, usually a single dose. The dosage is based on your weight.

For the best effect, take this medication at least 4 hours before or 2 hours after taking other products that contain aluminum, iron, zinc, selenium, calcium, or magnesium. These products may make this medication not work well. Some examples include antacids, vitamins/minerals, dairy products (such as milk, yogurt), and calcium-enriched juice.

Other kinds of infections may have symptoms like flu or can occur along with flu. These infections may need different kinds of treatment. Tell your doctor if you develop new symptoms during or after treatment, or if your condition does not get better, or if it gets worse.


Before taking baloxavir marboxil, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.


If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.

Do not share this medication with others.

This medication is not a substitute for the flu vaccine. Consult your doctor about the risks and important benefits of receiving a yearly flu shot to lower your chances of getting the flu.

Not applicable.

Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.


Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Tell your doctor if you have received flu vaccine in the nose within 2 weeks before treatment with this medication. This medication may lower your protection from flu vaccine given in the nose. After treatment with this medication, talk with your doctor or pharmacist before receiving flu vaccine.

Respond: 0
Minimum Market Price