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

One of mupirocin's clinical advantages is that it has essentially no known drug interactions. This is because mupirocin is applied topically, and its absorption through intact skin is minimal — less than 1.25% of the applied dose reaches the bloodstream. What isn't absorbed is quickly broken down in the skin itself.

That said, there are important application-related precautions that every patient should know — because while drug-drug interactions are not a concern, misuse can cause its own problems.

No Systemic Drug Interactions: Why?

Most drug interactions occur in the bloodstream or liver, where medications compete for the same metabolic enzymes (like CYP450) or affect the same organ systems. Because mupirocin barely enters the bloodstream, it doesn't compete with or affect other drugs in these ways.

According to FDA-approved labeling and multiple comprehensive drug interaction databases, there are no documented clinically significant drug interactions between mupirocin and other medications. This applies to:

Prescription oral medications (antibiotics, blood pressure drugs, antidepressants, etc.)

Over-the-counter medications (NSAIDs, antihistamines, antacids, etc.)

Dietary supplements and vitamins

Food and alcohol

Important Application Precautions (Not Systemic Interactions, But Still Critical)

While mupirocin doesn't interact with other drugs systemically, there are several important precautions about how it is applied:

Do not mix with other topical products. Mupirocin should not be applied at the same time as other lotions, creams, or ointments to the same skin area. Mixing products can alter mupirocin's release and bioavailability at the application site, potentially reducing its effectiveness. Apply mupirocin first, then wait; or apply other products to different areas.

Not for use with nasal products. Although mupirocin nasal ointment was previously available, the skin/dermatologic ointment formulation should not be used inside the nose at the same time as other nasal preparations. The PEG-based vehicle was designed for skin, not nasal mucosa.

Not for IV catheter or wound sites. Using mupirocin ointment at IV catheter insertion sites is contraindicated because it can promote fungal infections at those sites and potentially contribute to antimicrobial resistance in that environment.

Special Populations: What to Tell Your Doctor

Tell your doctor before using mupirocin if:

You have kidney problems. The polyethylene glycol (PEG) vehicle in mupirocin ointment can be absorbed through damaged or broken skin and is excreted by the kidneys. In patients with moderate-to-severe kidney disease, using mupirocin on large areas of damaged skin could allow PEG to accumulate. This is rarely a concern for small, intact-skin applications.

You have diarrhea. C. difficile-associated diarrhea has been reported with topical mupirocin (though very rarely). If you develop severe diarrhea during or after treatment, tell your doctor.

You've had previous reactions to topical antibiotics. While mupirocin has a different mechanism from other topical antibiotics, some patients are allergic to the vehicle ingredients (like PEG). Mention any prior reactions to topical products.

You are pregnant or breastfeeding. Mupirocin is considered low risk in pregnancy based on decades of data and minimal systemic absorption. However, always inform your provider so they can make an individualized decision.

What About Concurrent Oral Antibiotics?

Sometimes mupirocin is prescribed alongside oral antibiotics — for example, when a patient has extensive impetigo that warrants both topical and systemic treatment, or when treating MRSA with oral doxycycline or TMP-SMX plus topical mupirocin for decolonization.

There are no known pharmacokinetic interactions between mupirocin and oral antibiotics. Both can be used simultaneously without concern about one affecting the effectiveness or side effects of the other. Follow each medication's instructions separately.

The Bottom Line on Mupirocin Interactions

Mupirocin is one of the few medications you can prescribe or take with minimal concern about drug interactions. The main cautions are application-based: don't mix it with other topicals at the same site, keep it off IV sites, and avoid using the ointment formulation on large areas of damaged skin in patients with kidney disease. For more on mupirocin side effects, see our companion article: mupirocin side effects. If your pharmacy is out, medfinder can help you locate it.