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

One of the advantages of Bactroban (mupirocin) is its favorable drug interaction profile. Because it's applied topically and absorbs minimally into the bloodstream, it doesn't interact with most systemic medications. However, there are some important cautions — particularly around concurrent topical use and specific patient populations.

Does Bactroban Interact With Other Medications?

The short answer: no clinically significant drug-drug interactions are currently known for mupirocin with systemic medications. This includes:

No known interactions with oral antibiotics (including clindamycin, cephalexin, or amoxicillin that might be prescribed alongside Bactroban)

No known interactions with blood pressure medications, diabetes medications, or other common chronic medications

No known interactions with food or alcohol

This favorable profile is largely because mupirocin is metabolized rapidly at the skin surface and in the bloodstream to an inactive form (monic acid). It doesn't enter the liver's cytochrome P450 enzyme system, which is responsible for most drug-drug interactions.

The Important Caution: Other Topical Products

The one interaction-type caution with Bactroban is with other topical products. The FDA-approved prescribing information for Bactroban ointment specifically states:

Do not apply Bactroban ointment concurrently with any other lotions, creams, or ointments.

The reason is pharmacokinetic: the polyethylene glycol (PEG) base of Bactroban ointment can interact with other topical formulations in ways that may alter the release and absorption of the antibiotic. Mixing topicals can reduce Bactroban's effectiveness or change its absorption characteristics.

This includes:

Corticosteroid creams (like hydrocortisone or triamcinolone)

Moisturizers or emollients

Other topical antibiotics (bacitracin, neomycin, etc.)

Antifungal creams

If you need to use other topical products on the same area of skin, apply Bactroban first, allow it to be absorbed, and then apply the other product — or better yet, ask your prescriber whether the other topical product can be used on an adjacent but non-overlapping area of skin.

Polyethylene Glycol (PEG) and Kidney Function

Bactroban ointment contains polyethylene glycol (PEG 400 and PEG 3350) as its base. Under normal conditions — using a small amount on intact or minimally disrupted skin — PEG absorption is negligible. However, there are two situations where PEG can become a concern:

Large open wounds or extensive burns: PEG can be absorbed systemically through damaged skin in larger quantities and excreted by the kidneys. In patients with pre-existing kidney disease, this can potentially worsen renal function.

Patients with severe renal impairment: Should use Bactroban with caution, particularly on large wounds. Tell your doctor if you have chronic kidney disease (CKD) before using Bactroban on any large or open wound area.

What to Tell Your Doctor Before Using Bactroban

Before starting Bactroban, inform your healthcare provider if:

You have a known allergy to mupirocin or polyethylene glycol

You have chronic kidney disease (CKD) or are on dialysis — especially if applying to large wound areas

You are currently using other topical medications on the same area of skin

You are pregnant or breastfeeding

You have experienced diarrhea with previous antibiotic use (which may indicate susceptibility to C. difficile)

Summary: Bactroban Interaction Risk Is Low

Mupirocin is one of the safest antibiotics from an interaction standpoint. Its topical application and rapid systemic inactivation mean it's unlikely to cause problems with your other medications. The main practical caution is to avoid applying other topicals on the same skin area at the same time. For a full discussion of Bactroban's side effects, see our guide: Bactroban Side Effects: What to Expect and When to Call Your Doctor.