Venofer Drug Interactions: What to Avoid and What to Tell Your Doctor

Before you begin Venofer (iron sucrose injection) infusions, your prescribing provider should review all medications, vitamins, and supplements you're taking. While Venofer itself is given as an IV medication and doesn't pass through the digestive system, it can still affect — and be affected by — other drugs, particularly those that are taken orally and that interact with iron's chemistry in the gut or bloodstream.

Here's a detailed breakdown of the most clinically important drug interactions with iron sucrose (Venofer).

Most Important Interaction: Oral Iron Supplements

Venofer can reduce the absorption of oral iron preparations taken concurrently. This is the most practically relevant interaction for most patients. If you're receiving Venofer IV infusions, taking oral iron supplements at the same time typically provides little additional benefit — and may complicate monitoring of your iron levels.

Brands to be aware of: ferrous sulfate (FeroSul, Slow FE), ferrous gluconate, ferrous fumarate, polysaccharide-iron complex (Niferex). If you take any of these, tell your nephrologist or infusion provider.

Serious Interaction: Baloxavir Marboxil (Xofluza)

Iron sucrose (Venofer) has a serious interaction with baloxavir marboxil (Xofluza), the influenza antiviral. Iron (as a polyvalent cation) can bind to baloxavir in the GI tract and dramatically reduce its absorption, potentially making the antiviral ineffective. This interaction has been demonstrated in monkey studies and the FDA label says to avoid the combination.

This interaction is relevant only to oral forms of iron (if you're also taking oral iron supplements). Since Venofer is IV, it does not directly interfere with oral baloxavir absorption — but if you're prescribed baloxavir for flu treatment and you also take oral iron supplements, those supplements should be held while taking baloxavir. Always inform your prescribers of all your iron-related medications.

Serious Interactions: Fluoroquinolone Antibiotics

Iron (from oral iron supplements taken alongside Venofer therapy) can significantly reduce the absorption of fluoroquinolone antibiotics. Ciprofloxacin absorption can be reduced by up to 90% when taken concurrently with iron-containing products. This applies to:

Ciprofloxacin (Cipro): Up to 90% reduction in bioavailability — avoid or separate by 2 hours before or 6 hours after iron

Ofloxacin, fleroxacin: Similar absorption reduction — avoid concurrent use or separate doses adequately

Again, these interactions apply to oral iron taken alongside Venofer — IV Venofer itself does not directly affect the absorption of oral antibiotics, but if you're taking concurrent oral iron supplements, you need to manage these interactions carefully.

Serious Interactions: Tetracycline Antibiotics

Oral iron significantly reduces the absorption of tetracycline-class antibiotics by forming insoluble iron-tetracycline complexes in the gut. Affected drugs include:

Doxycycline (Vibramycin) — commonly used for skin and respiratory infections

Tetracycline (Sumycin)

Oxytetracycline, demeclocycline, omadacycline, sarecycline

If prescribed a tetracycline while on Venofer therapy, avoid taking oral iron within 2–3 hours of your antibiotic dose. Ideally, avoid concurrent oral iron supplementation during the antibiotic course.

39,483+ patients found their medications in stock

39K+

Find Venofer In Stock Today →

Serious Interaction: Eltrombopag (Promacta/Revolade)

Iron sucrose (both IV and oral) interacts with eltrombopag (Promacta), a platelet-stimulating agent used in immune thrombocytopenia (ITP) and some forms of aplastic anemia. Iron reduces eltrombopag absorption significantly by chelation. If you take eltrombopag and require Venofer, these medications must be separated by at least 4 hours.

Moderate Interactions: Proton Pump Inhibitors and H2 Blockers

Proton pump inhibitors (PPIs) — such as omeprazole (Prilosec), pantoprazole (Protonix), esomeprazole (Nexium) — and H2 receptor blockers like famotidine (Pepcid) and cimetidine can reduce oral iron absorption by raising gastric pH. This interaction does not directly affect IV iron (Venofer), but is important if you're taking oral iron supplements alongside your Venofer infusions.

Skip the calls, skip the stress.

Find Venofer In Stock Today →

50K+

Medications
Found

99%

Success
Rate

6+

Hours saved
on average

Minor Interaction: ACE Inhibitors and Hypotension

Iron sucrose and ACE inhibitors like benazepril (Lotensin) or lisinopril may have a pharmacodynamic interaction that slightly increases the risk of hypotension (low blood pressure). Since hypotension is already a common side effect of Venofer — especially in dialysis patients — this combination warrants monitoring. Tell your infusion nurse if you take an ACE inhibitor so they can watch your blood pressure closely during the infusion.

Interaction: Oral Mycophenolate (CellCept/Myfortic)

Oral iron can reduce the absorption of mycophenolate (CellCept), an immunosuppressant commonly taken by kidney transplant patients. If you've had a kidney transplant and are taking mycophenolate, carefully separate any oral iron supplements from your mycophenolate doses and inform your transplant team.

What to Tell Your Doctor Before Starting Venofer

All prescription medications, including antibiotics, antivirals, immunosuppressants, and blood pressure medications

All over-the-counter medications, including antacids, PPIs, and H2 blockers

All vitamins and mineral supplements, including multivitamins that contain iron

Any history of prior reactions to IV iron or other injectable medications. (See our Venofer side effects guide for more detail on adverse reactions.)