POLYMYXIN B
Generic: Polymyxin B sulfate
- Manufacturer
- Pfizer
- NDC
- 68071-4375
- RxCUI
- 204509
- Route
- INTRAMUSCULAR
- ICD-10 indication
- A41.52
Affordability Check
How much will you actually pay for POLYMYXIN B?
In 30 seconds, see every legitimate way to afford POLYMYXIN B — Medicare copay, manufacturer copay card, Patient Assistance Program, grants, or cash.
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.
External links go directly to the manufacturer's portal. RxCopays does not receive compensation for referrals.
Compare pricing elsewhere
RxCopays doesn't sell drugs or take referral fees. Here are the transparent-pricing directories we recommend checking alongside your insurance formulary.
Cost Plus Drug Company
Mark Cuban's transparent-pricing pharmacy — manufacturer cost + 15% markup + $5 dispensing fee. No insurance needed. Search alphabetically for Polymyxin B sulfate.
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GoodRx
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Lookup POLYMYXIN B →
NeedyMeds
Independent nonprofit directory of patient assistance programs, copay cards, and charity co-pay foundations.
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RxAssist
PAP directory maintained by Volunteers in Health Care at Brown University. Free, no ads.
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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
Dosage and administration
Contraindications
Warnings
Adverse reactions
Use in pregnancy
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
| Tier | Formularies on this tier | Share |
|---|---|---|
| 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
| Payer | PA | Step therapy | Copay tier |
|---|---|---|---|
— Medicare Part D | — | — | — |
— Medicare Part D | — | — | — |
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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.