Drug interactions
Baloxavir marboxil + Ferrous fumarate
Severity: Moderate
Baloxavir marboxil and Ferrous fumarate: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Baloxavir can bind to polyvalent cations such as iron in the gut, which may lower its absorption and reduce plasma exposure. This could weaken antiviral effect during influenza treatment or prophylaxis. Supporting data come mainly from animal studies.
What this interaction means in plain words
Baloxavir marboxil and Ferrous fumarate can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Baloxavir marboxil belongs to Anti Virals; Ferrous fumarate belongs to Miscellaneous.
Why it happens
Chelation of baloxavir by iron in the gastrointestinal tract reduces its oral absorption.
What to do
Avoid taking oral iron products at the same time as baloxavir; if iron is required, give baloxavir at a different time than the iron dose, or use an alternative antiviral if separation is not feasible.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Ferrous fumarate
Other interactions of Baloxavir marboxil
- Aluminum hydroxide + Baloxavir marboxil Moderate
- Baloxavir marboxil + Calcium Moderate
- Baloxavir marboxil + Calcium carbonate Moderate
- Baloxavir marboxil + Carbonyl iron Moderate
- Baloxavir marboxil + Ferrous gluconate Moderate
- Baloxavir marboxil + Ferrous sulfate Moderate
Frequently asked questions
Can I take Baloxavir marboxil with Ferrous fumarate?
MediHelp rates the interaction as moderate. Baloxavir marboxil and Ferrous fumarate can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Baloxavir can bind to polyvalent cations such as iron in the gut, which may lower its absorption and reduce plasma exposure. This could weaken antiviral effect during influenza treatment or prophylaxis. Supporting data come mainly from animal studies.
How serious is the interaction between Baloxavir marboxil and Ferrous fumarate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid taking oral iron products at the same time as baloxavir; if iron is required, give baloxavir at a different time than the iron dose, or use an alternative antiviral if separation is not feasible.
What other medicines interact with Ferrous fumarate?
MediHelp also lists interactions of Ferrous fumarate with, for example, Ciprofloxacin, Acetohydroxamic acid, Aluminum hydroxide. The full list is on the Ferrous fumarate page.
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