How to Save Money on Colistin in 2026: Coupons, Discounts, and Patient Assistance

Colistin Is Expensive — But There Are Ways to Save

Colistin (Colistimethate Sodium) is a critical last-resort antibiotic used to treat life-threatening multidrug-resistant gram-negative infections. If your doctor prescribed it, you probably didn't have a choice in the matter — this medication may be the only thing that works against your infection.

But when you see the price tag, it can be a shock. Without insurance, Colistin can cost more than $1,300 for a standard course of treatment. Even with insurance, out-of-pocket costs can be significant depending on your plan.

In this guide, we'll break down what Colistin actually costs in 2026 and share every way we know to bring that price down.

What Does Colistin Cost Without Insurance?

Colistin is sold as Colistimethate Sodium for injection, in vials containing 150 mg of colistin base activity each. Here's what you're looking at price-wise:

• Average retail price (30 vials): ~$1,306
• Per-vial cost (retail): ~$43 per vial
• Brand name (Coly-Mycin M, 6 vials): Starting at ~$186
• Generic wholesale cost: ~$31-44 per vial

A typical treatment course may require multiple vials per day for 1-3 weeks, depending on the infection severity and your body weight. At the standard dose of 2.5-5 mg/kg/day, a 70 kg patient might use 2-3 vials per day, meaning a two-week course could require 28-42 vials.

That puts the potential total cost at $1,200 to $1,800+ without any discounts.

Coupons and Discount Cards

Even though Colistin is a hospital injectable, discount programs can still help — especially if you're filling through an outpatient or specialty pharmacy.

SingleCare

SingleCare offers one of the best discounts we've found for Colistimethate Sodium:

• Price with coupon: ~$207 for 30 vials (150 mg each)
• Savings: Up to 84% off the retail price
• Free to use, no membership required
• Search at singlecare.com

Optum Perks

Optum Perks (formerly SearchRx) also provides coupons for Coly-Mycin M and generic Colistimethate Sodium. Discounts vary by pharmacy but can significantly reduce costs.

GoodRx

GoodRx may have limited listings for Colistimethate Sodium since it's primarily a hospital injectable, but it's worth checking — prices and availability vary by location.

Other Discount Programs

You can also check:

• RxSaver
• BuzzRx
• America's Pharmacy
• ScriptSave WellRx

Keep in mind: not every pharmacy that accepts these coupons will have Colistin in stock. Use Medfinder first to find a pharmacy with supply, then apply your coupon there.

Patient Assistance Programs

Patient assistance programs (PAPs) are designed for people who are uninsured, underinsured, or facing financial hardship. While Colistin doesn't have a dedicated manufacturer savings program (it's primarily generic), there are other avenues:

NeedyMeds

NeedyMeds (needymeds.org) maintains a database of assistance programs for a wide range of medications, including injectable antibiotics. They can help you find:

• Patient assistance programs from manufacturers
• State pharmaceutical assistance programs
• Disease-specific foundations that may cover medication costs

RxAssist

RxAssist (rxassist.org) is a comprehensive database of patient assistance programs. Search for Colistimethate Sodium to find any available programs.

Hospital Financial Assistance / Charity Care

If Colistin is being administered during a hospital stay, many hospitals offer financial assistance programs (sometimes called charity care) that can reduce or eliminate the cost for patients who qualify. Requirements vary by hospital but generally consider income level relative to the federal poverty line.

Ask the hospital's billing department or social worker about:

• Charity care applications
• Sliding scale payment programs
• Hardship waivers

State Pharmaceutical Assistance Programs (SPAPs)

Some states offer their own prescription assistance programs that may cover injectable antibiotics. Check with your state's health department for eligibility.

Other Ways to Save

Use Generic Colistimethate Sodium

The generic version of Colistin is significantly cheaper than the brand-name Coly-Mycin M. At approximately $31-44 per vial wholesale (vs. ~$31 per vial for brand), generic pricing is competitive, but retail markups vary widely. Always ask your pharmacy if the generic is available.

Insurance Coverage: Know Your Benefits

Colistin is almost always billed under the medical benefit (not pharmacy), since it's administered by injection in clinical settings. This means:

• Your deductible and coinsurance apply, not a copay
• Prior authorization may be required — make sure your provider submits it early
• If administered during a hospital admission, it's typically included in the hospital charges
• For outpatient infusion, verify that your infusion center is in-network

Ask About Step Therapy Exemptions

Colistin is typically a last-resort antibiotic, meaning your doctor has already tried (or ruled out) other options. If your insurer requires step therapy, your provider can usually document medical necessity to get an exemption quickly.

Compare Pharmacy Prices

Even for injectables, prices can vary between pharmacies. Use Medfinder to find pharmacies with stock, then compare coupon prices before filling.

A Note About Colistin Alternatives

If cost is a barrier and your infection may respond to other antibiotics, talk to your doctor about whether an alternative might work. Options like Polymyxin B, Amikacin, or Tobramycin may have different pricing profiles. For a full comparison, see our guide on alternatives to Colistin.

Final Thoughts

Colistin is not cheap, but it's far from the most expensive antibiotic you could be prescribed. With discount coupons, patient assistance programs, and insurance optimization, most patients can access it at a manageable cost. The key is to start early: verify your insurance coverage, find a pharmacy with stock using Medfinder, and apply for assistance programs before you need the next dose.

For more information about Colistin, explore our other guides:

• What Is Colistin? Uses, Dosage, and What You Need to Know
• Colistin Side Effects: What to Expect
• Colistin Shortage Update for 2026