Baloxavir Marboxil and Selenium Interaction
Drug interaction information between Baloxavir Marboxil and Selenium.
Baloxavir Marboxil and Selenium have a documented moderate interaction in FDA labeling.
FDA drug labeling documents a moderate-severity interaction between Baloxavir Marboxil and Selenium. Major interactions are generally avoided, moderate ones may need monitoring or a dose adjustment, and minor ones are usually low-risk. This page shows the documented mechanism and guidance. Label-documented interactions are not a complete safety review, so always confirm your own medications with a pharmacist or doctor. Educational information, not medical advice.
How They Interact
Selenium can attach to the medicine in your digestive system and stop it from getting into your bloodstream. This prevents the drug from working correctly.
What To Do
Avoid taking selenium supplements at the same time as this medication. Talk to your doctor about when it is safe to take your supplements.
FDA Label Information
7 DRUG INTERACTIONS Avoid coadministration of XOFLUZA with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids, or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc). Avoid coadministration of XOFLUZA with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids, or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc).
Baloxavir Marboxil Also Interacts With
- Zinc Sulfate moderate
Frequently Asked Questions
Can I take Baloxavir Marboxil and Selenium together?
This is a moderate interaction. Avoid taking selenium supplements at the same time as this medication. Talk to your doctor about when it is safe to take your supplements.
How serious is the interaction between Baloxavir Marboxil and Selenium?
This interaction is classified as "moderate" severity by the FDA. Moderate interactions may worsen your condition or change how your medications work.
Why do Baloxavir Marboxil and Selenium interact?
Selenium can attach to the medicine in your digestive system and stop it from getting into your bloodstream. This prevents the drug from working correctly.
Understanding the Baloxavir Marboxil and Selenium Interaction
FDA-approved prescribing information for these two drugs flags their combination as a moderate-severity interaction. Baloxavir Marboxil belongs to the Endonuclease Inhibitor (Antiviral) class and Selenium belongs to the Mineral Supplement class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Selenium can attach to the medicine in your digestive system and stop it from getting into your bloodstream. Severity tiers matter: major flags generally advise avoidance, moderate flags often require monitoring or dose adjustment, and minor flags may only call for awareness.
Context around a specific patient determines real-world impact. Baloxavir Marboxil has 2 total documented interactions on file in this dataset, and Selenium has 1. Each additional medication compounds the interaction surface, which is why pharmacists run full-profile checks rather than evaluating one pair at a time. FDA-derived guidance for this pair is: Avoid taking selenium supplements at the same time as this medication. Timing of doses, renal and hepatic function, age, and other concurrent prescriptions all shape whether a labeled interaction matters clinically.
An interaction flag is not a verdict. A large share of labeled interactions are managed routinely in clinical practice, the fix may be as simple as spacing doses or adding a monitoring test. Others require the prescriber to choose a different medication entirely. This page surfaces FDA-sourced labeling and openFDA data for educational purposes only; it is not medical advice and cannot account for your full clinical picture. Never start, stop, or adjust either Baloxavir Marboxil or Selenium based on a web page, speak with your prescriber or pharmacist before making any change.
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. Always consult your healthcare provider about drug interactions.
Read our methodology - how this data is sourced, computed, and verified.