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POLYMYXIN B

Generic: Polymyxin B sulfate

Verified·Apr 23, 2026
Manufacturer
Pfizer
NDC
68071-4375
RxCUI
204509
Route
INTRAMUSCULAR
ICD-10 indication
A41.52

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About POLYMYXIN B

What is this medication? Polymyxin B is a potent antibiotic medication primarily used to treat serious infections caused by specific types of Gram-negative bacteria, such as Pseudomonas aeruginosa. It belongs to a class of drugs known as polypeptides and works by disrupting the cell membranes of the bacteria, ultimately leading to their destruction. Because it is highly effective against resistant strains, healthcare providers often reserve this medication for severe cases where other first-line antibiotics have proven ineffective or cannot be used.

The medication is administered in various forms depending on the location and severity of the infection, including intravenous injections, eye drops, or topical ointments. When given systemically, it is frequently used to address life-threatening conditions like infections of the urinary tract, bloodstream, or the membranes surrounding the brain and spinal cord. Due to the risk of side effects involving the kidneys and neurological system, patients receiving systemic treatment are typically monitored closely by medical professionals in a clinical environment.

Copay & patient assistance

Detailed copay and financial assistance information is not publicly available for this medication at this time. Please consult your pharmacist or the manufacturer's official patient support program for more details.

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Prescribing information

From the FDA-approved label for POLYMYXIN B. Official source: DailyMed (NLM) · Label effective Jun 7, 2024

Indications and usage
INDICATIONS AND USAGE: For steroid-responsive inflammatory ocular conditions for which a corticosteroid is indicated and where bacterial infection or a risk of bacterial ocular infection exists. Ocular corticosteroids are indicated in inflammatory conditions of the palpebral and bulbar conjunctiva, cornea, and anterior segment of the globe where the inherent risk of corticosteroids use in certain infective conjunctivitides is accepted to obtain a diminution in edema and inflammation. They are also indicated in chronic anterior uveitis and corneal injury from chemical, radiation or thermal burns; or penetration of foreign bodies. The use of a combination drug with an anti-infective component is indicated where the risk of infection is high or where there is an expectation that potentially dangerous numbers of bacteria will be present in the eye. The particular anti-infective drug in this product is active against the following common bacterial eye pathogens: Staphylococcus aureus, Escherichia coli , Haemophilus influenzae, Klebsiella/Enterobacter species, Neisseria species, and Pseudomonas aeruginosa. This product does not provide adequate coverage against: Serratia marcescens, and streptococci, including Streptococcus pneumoniae.
Dosage and administration
DOSAGE AND ADMINISTRATION: One or two drops in the conjunctival sac(s). In severe disease, drops may be used hourly, being tapered to discontinuation as the inflammation subsides. In mild disease, drops may be used up to four to six times daily. Not more than 20 mL should be prescribed initially and the prescription should not be refilled without further evaluation as outlined in PRECAUTIONS above. FOR TOPICAL OPHTHALMIC USE ONLY. SHAKE WELL BEFORE USING.
Contraindications
CONTRAINDICATIONS: Neomycin and Polymyxin B Sulfates and Dexamethasone Ophthalmic Suspension is contraindicated in most viral diseases of the cornea and conjunctiva, including epithelial herpes simplex keratitis (dendritic keratitis), vaccinia, varicella, and also in mycobacterial infection of the eye and fungal diseases of ocular structures. Neomycin and Polymyxin B Sulfates and Dexamethasone Ophthalmic Suspension is also contraindicated in individuals with known or suspected hypersensitivity to any of the ingredients of this preparation and to other corticosteroids.
Warnings
WARNINGS: Prolonged use of corticosteroids may result in glaucoma with damage to the optic nerve, defects in visual acuity and fields of vision, and in posterior subcapsular cataract formation. Prolonged use may also suppress the host immune response and thus increase the hazard of secondary ocular infections. Various ocular diseases and long-term use of topical corticosteroids have been known to cause corneal and scleral thinning. Use of topical corticosteroids in the presence of thin corneal or scleral tissue may lead to perforation. Acute purulent infections of the eye may be masked or activity enhanced by the presence of corticosteroid medication. If this product is used for 10 days or longer, intraocular pressure should be routinely monitored even though it may be difficult in children and uncooperative patients. Steroids should be used with caution in the presence of glaucoma. Intraocular pressure should be checked frequently. The use of steroids after cataract surgery may delay healing and increase the incidence of bleb formation. Use of ocular steroids may prolong the course and may exacerbate the severity of many viral infections of the eye (including herpes simplex). Employment of a corticosteroid medication in the treatment of patients with a history of herpes simplex requires great caution; frequent slit lamp microscopy is recommended. Neomycin and Polymyxin B Sulfates and Dexamethasone Ophthalmic Suspension is not for injection. It should never be injected subconjunctivally, nor should it be directly introduced into the anterior chamber of the eye. Products containing neomycin sulfate may cause cutaneous sensitization.
Adverse reactions
ADVERSE REACTIONS: Adverse reactions have occurred with corticosteroid/anti-infective combination drugs which can be attributed to the corticosteroid component, the anti-infective component, or the combination. Exact incidence figures are not available since no denominator of treated patients is available. Reactions occurring most often from the presence of the anti-infective ingredient are allergic sensitizations. The reactions due to the corticosteroid component are: elevation of intraocular pressure (IOP) with possible development of glaucoma and infrequent optic nerve damage; posterior subcapsular cataract formation; and delayed wound healing. Corticosteroid-containing preparations have also been reported to cause perforation of the globe. Keratitis, conjunctivitis, corneal ulcers, and conjunctival hyperemia have occasionally been reported following local use of steroids. To report SUSPECTED ADVERSE REACTIONS, contact Bausch + Lomb, a division of Valeant Pharmaceuticals North America LLC, at 1-800-321-4576 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .
Use in pregnancy
Pregnancy Teratogenic Effects Pregnancy Category C. Dexamethasone has been shown to be teratogenic in mice and rabbits following topical ophthalmic application in multiples of the therapeutic dose. In the mouse, corticosteroids produce fetal resorptions and a specific abnormality, cleft palate. In the rabbit, corticosteroids have produced fetal resorptions and multiple abnormalities involving the head, ears, limbs, palate, etc. There are no adequate or well-controlled studies in pregnant women. Neomycin and Polymyxin B Sulfates and Dexamethasone Ophthalmic Suspension should be used during pregnancy only if the potential benefit to the mother justifies the potential risk to the embryo or fetus. Infants born of mothers who have received substantial doses of corticosteroids during pregnancy should be observed carefully for signs of hypoadrenalism.

Label text is reproduced as-is from the FDA-approved label. We do not paraphrase, summarize, or omit. Content above is for informational purposes only and is not medical advice. Always consult your prescribing clinician or pharmacist before making decisions about your medication.

Conditions we've indexed resources for

Click a condition to see copay cards, grants, and PA rules specific to it. For the full list of FDA-approved indications, see Prescribing information above.

Medicare Part D coverage

How POLYMYXIN B appears across Medicare Part D plan formularies nationally. Source: CMS monthly Prescription Drug Plan file (2026-04-30).

Covered by plans

84%

4,646 of 5,509 plans

Most common tier

Tier 4

On 52% of covering formularies

Prior authorization required

0%

of covering formularies

TierFormularies on this tierShare
Tier 1 (preferred generic)32
19%
Tier 2 (generic)35
21%
Tier 3 (preferred brand)14
8%
Tier 4 (non-preferred brand)88
52%

Step therapy: 0% of formularies

Quantity limits: 1% of formularies

Coverage breadth: 169 of 65 formularies

How to read this:plans on the same formulary share tier + PA rules. Your specific plan's copay depends on (a) the tier above, (b) your plan's cost-share for that tier, (c) whether you're in the initial coverage phase or past the 2026 $2,000 out-of-pocket cap. For your exact plan, check its Summary of Benefits or log in to your Medicare.gov account. Copay cards don't apply to Medicare (federal law).

Prior authorization & coverage

PayerPAStep therapyCopay tier

Medicare Part D

Medicare Part D

Related drugs

How this page is sourced

  • Drug identity verified against openFDA NDC Directory.
  • Label text (when shown) originates from NLM DailyMed.
  • Copay and assistance URLs verified periodically; if you hit a broken link, tell us.

Rare-disease navigation (specialists, trials, patient communities)

POLYMYXIN B treats 2 rare conditions. For in-depth disease pages on our sister site:

UniteRare.org is our sister site for rare-disease navigation — same editorial team, same accuracy standards.