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Bacitracin Zinc + Neomycin + Polymyxin B Bacitracin zinc, neomycin, and polymyxin B is a topical antibiotic combination, sold over the counter as triple antibiotic ointment under brand names such as Neosporin. Blended into a petroleum-jelly base, the three antibiotics attack bacteria in complementary ways and together cover a wide range of gram-positive and gram-negative organisms. It is applied to minor cuts, scrapes, and burns to lower the chance of skin infection while a wound heals.
- Three antibiotics covering a wide bacterial range at once
- Lowers the chance of infection in minor cuts and scrapes
- The petrolatum base keeps a wound surface moist while healing
- Works locally with very little absorption into the body
- Sold over the counter as the familiar triple antibiotic ointment
- A first aid staple for scrapes and small burns
- Allergic contact dermatitis, most often from the neomycin component, causing redness, itching, and rash
- Rare immediate allergic reactions to bacitracin, including uncommon reports of anaphylaxis on broken skin
- Best kept to minor wounds, since large amounts on extensive or open wounds raise the chance of drug absorption
Overview
Bacitracin zinc, neomycin, and polymyxin B, commonly called triple antibiotic ointment, is a nonprescription combination product used to prevent infection in minor skin injuries. The three active antibiotics are suspended in a petrolatum (petroleum jelly) base and spread on the skin, and the product is familiar under brand names such as Neosporin along with many generic equivalents [1]. It is available over the counter in the United States and Canada and is meant for shallow cuts, scrapes, and small burns rather than deep or serious wounds [1].
Each ingredient contributes a different antibacterial action and spectrum. Bacitracin, a polypeptide antibiotic formulated here as its zinc salt, is active mainly against gram-positive bacteria and works by interfering with construction of the bacterial cell wall. Neomycin is an aminoglycoside antibiotic, discovered in 1949, that blocks bacterial protein synthesis and covers many gram-negative organisms along with some gram-positive ones. Polymyxin B is a cyclic polypeptide that breaks down the outer membrane of gram-negative bacteria [1]. By combining agents with overlapping but distinct spectra, the ointment achieves broad coverage of the organisms most likely to contaminate everyday wounds [1].
Clinical reviews support the combination as a safe and effective way to reduce infection in minor contaminated wounds, and reviewers note that bacterial resistance to it does not develop readily [1]. At the same time, the evidence that topical antibiotics meaningfully speed the healing of clean wounds is limited; for an uncomplicated clean wound, plain petrolatum can perform comparably while sidestepping the risk of allergy [2]. The mixture has also been examined in veterinary and laboratory settings as a topical treatment for skin lesions [4].
The product is regulated as an over-the-counter topical drug. Its best-known drawback is allergic contact dermatitis, most often attributed to the neomycin component, which can produce redness, itching, and rash where it is applied [1][3]. Less commonly, bacitracin has been linked to immediate hypersensitivity, including rare reports of anaphylaxis with detectable IgE antibodies to the drug, particularly when it is put on broken skin [3]. Because aminoglycosides can be toxic to hearing and the kidneys, spreading large amounts over extensive or open wounds is generally discouraged [1].
Mechanism
The three antibiotics in the ointment suppress bacteria through separate mechanisms, which is the whole rationale for combining them. Bacitracin, active chiefly against gram-positive bacteria, blocks synthesis of the bacterial cell wall; it interferes with the lipid carrier molecule that ferries cell-wall building blocks across the membrane, so the wall cannot be properly assembled [1]. Neomycin, an aminoglycoside, enters bacteria and binds the 30S subunit of the ribosome, causing the cell to misread its genetic code and churn out faulty proteins, which is lethal to a broad range of gram-negative and some gram-positive organisms [1].
Polymyxin B behaves like a cationic detergent: it binds the lipopolysaccharide of the outer membrane of gram-negative bacteria and disrupts membrane integrity, so the cell contents leak out [1]. Because the three agents hit the cell wall, the ribosome, and the membrane respectively, their combined spectrum is wider than any one alone, and the mixed targets help explain why resistance to the ointment emerges slowly [1]. That same pharmacology underlies its main downside: neomycin is a frequent cause of allergic contact sensitization, and repeated exposure can prime the immune system to react on later contact [1][3].
receptor fingerprint
Bacterial cell wall (bactoprenol recycling)inhibits
30S ribosomal subunitinhibits
Gram-negative outer membraneblocks
Bacterial lipopolysaccharideblocks
Broad skin florainhibits
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
This is an over-the-counter topical, but it is not risk free. The neomycin component is a well-known cause of allergic contact dermatitis, so redness, itching, and worsening rash at the site often mean an allergy rather than infection. It should not be used on large surface areas, deep or puncture wounds, or animal bites without medical advice, since absorbed neomycin and polymyxin B carry a theoretical risk of kidney and nerve toxicity. Avoid getting it in the eyes unless using a product made for that purpose. If a wound is not improving in a few days or shows spreading redness, pus, or fever, a clinician should take a look.
Subjective profileweighing the evidence above
Fine for a small cut kept clean and covered, which is most of what it is for. Worth knowing that neomycin is a common cause of allergic rash, so a wound that gets redder and itchier on the ointment is usually reacting to it. Keep it off large, deep or open wounds.
Where to buy
Suppliers
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PCT.Zone
Bacitracin Zinc + Neomycin + Polymyxin B
Research
- 2007first citedTopical triple-antibiotic ointment as a novel therapeutic choice in wound management and infect…
- 2016most recentComparison of 3 Topical Treatments against Ulcerative Dermatitis in Mice with a C57BL/6 Backgro…
- 1.Topical triple-antibiotic ointment as a novel therapeutic choice in wound management and infection prevention: a practical perspective
- 2.Clinical inquiries. Do topical antibiotics improve wound healing?
- 3.Detection of IgE antibodies to bacitracin using a commercially available streptavidin-linked solid phase in a patient with anaphylaxis to triple antibiotic ointment
- 4.Comparison of 3 Topical Treatments against Ulcerative Dermatitis in Mice with a C57BL/6 Background
4 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Is this the same as Neosporin?
Yes; the bacitracin, neomycin, and polymyxin B combination is the classic triple antibiotic ointment sold as Neosporin and various store brands.
Why is my skin getting redder after using it?
That can be an allergic reaction to the neomycin rather than an infection; if the area gets itchier and more inflamed, stop and switch to plain petrolatum.
Can I use it on a deep cut or puncture?
No; it is for minor surface wounds only, and deep, dirty, or puncture wounds should be seen by a clinician.
Do minor cuts even need an antibiotic ointment?
Often a clean wound kept moist with plain petrolatum heals just as well; the ointment mainly helps lower infection risk in wounds prone to contamination.
How long can I keep using it?
Limit it to about a week; if the wound is not healing or looks infected with spreading redness or pus, get medical advice.
Adverse effects
- Allergic contact dermatitis, most often from the neomycin component, causing redness, itching, and rash
- Rare immediate allergic reactions to bacitracin, including uncommon reports of anaphylaxis on broken skin
- Best kept to minor wounds, since large amounts on extensive or open wounds raise the chance of drug absorption
- Aminoglycosides can affect hearing and the kidneys if enough is absorbed, so heavy use over big areas is discouraged
Notes and cautions
- Overuse of topical antibiotics can contribute to bacterial resistance over time