A Practical Guide for Providers Prescribing Cortisporin-Tc

You've determined that Cortisporin-Tc (colistin sulfate/neomycin sulfate/thonzonium bromide/hydrocortisone acetate otic suspension) is the right medication for your patient. But there's a growing disconnect between writing the prescription and the patient actually filling it. Cortisporin-Tc — a brand-only, high-cost, niche otic product — is one of the harder-to-find ear drops in the U.S. pharmacy landscape.

This guide provides actionable steps your practice can take to improve fill rates, reduce patient frustration, and ensure continuity of care when Cortisporin-Tc is specifically indicated.

Current Availability: What Providers Should Know

Cortisporin-Tc remains in active production by Endo Pharmaceuticals (Endo USA, Inc.) and is not on the FDA's formal drug shortage list. However, pharmacy-level availability is limited:

• Most large chain pharmacies (CVS, Walgreens, Rite Aid) do not routinely stock it. The high per-unit cost ($234–$350 for 10 mL) and low turnover make it an unattractive inventory item.
• Wholesaler availability is generally intact. Pharmacies that order it can typically receive it within 1–2 business days.
• Independent and specialty pharmacies are more likely to stock or quickly source it, especially those serving ENT practices.
• Hospital outpatient pharmacies affiliated with otolaryngology departments frequently carry it.

Why Patients Can't Find Cortisporin-Tc

Understanding the barriers helps you anticipate and address them proactively:

No Generic Competition

Cortisporin-Tc's four-ingredient combination (colistin, neomycin, thonzonium bromide, hydrocortisone acetate) has no generic equivalent. This means pharmacies can't substitute a cheaper generic, and patients can't price-shop among manufacturers. The result: limited stocking and limited competition.

Insurance Friction

Most formularies exclude Cortisporin-Tc or place it on non-preferred brand tiers. Prior authorization is frequently required. Step therapy protocols typically mandate trials of generic ofloxacin otic or neomycin/polymyxin B/hydrocortisone first. This administrative friction means many prescriptions go unfilled.

Cost Barrier

At $234–$350 per bottle without insurance, many patients experience sticker shock at the pharmacy counter and abandon the fill. No manufacturer copay card, savings program, or dedicated patient assistance program currently exists for Cortisporin-Tc.

What Providers Can Do: 5 Practical Steps

Step 1: Verify Availability Before the Patient Leaves

Use Medfinder for Providers to check pharmacy-level stock while the patient is still in your office. This takes seconds and prevents the frustrating scenario where the patient drives to a pharmacy only to learn it's not in stock.

If Cortisporin-Tc isn't available nearby, you can discuss alternatives or identify a pharmacy that stocks it before the patient leaves — dramatically improving the likelihood of a successful fill.

Step 2: Send the Prescription to the Right Pharmacy

Avoid defaulting to the patient's usual chain pharmacy without checking. If your Medfinder search or a quick phone call reveals that an independent pharmacy, hospital outpatient pharmacy, or specialty pharmacy has it in stock, send the prescription there directly.

Consider maintaining an internal reference list of pharmacies in your area that reliably stock niche otic medications like Cortisporin-Tc.

Step 3: Prepare for Prior Authorization

Have your documentation ready. When submitting a PA for Cortisporin-Tc, include:

• Specific indication (e.g., mastoidectomy cavity infection, post-fenestration infection, chronic otitis media unresponsive to first-line agents)
• Prior treatment attempts and why alternatives were inadequate
• Expected treatment duration (typically ≤10 days)
• Clinical rationale for why the colistin-based formulation with thonzonium is preferred over standard Cortisporin Otic or fluoroquinolone drops

Step 4: Discuss Cost Proactively

Don't let the patient discover the $300+ price tag at the pharmacy counter. Address cost during the office visit:

• Inform the patient that Cortisporin-Tc is brand-only and may cost $234–$350 without insurance
• Suggest using a free discount card (GoodRx, SingleCare) which may bring the price to ~$224
• Confirm insurance coverage before finalizing the prescription when possible
• Be prepared to offer alternatives if cost is prohibitive

Step 5: Offer a Backup Plan

Write the Cortisporin-Tc prescription as the primary, but discuss what happens if the patient can't fill it. Having a pre-agreed backup option prevents delays in treatment:

• "If they can't fill Cortisporin-Tc, call our office and we'll send over [alternative] instead."
• Some providers write both prescriptions simultaneously, noting on the alternative that it should only be filled if Cortisporin-Tc is unavailable.

Alternative Agents for Reference

When Cortisporin-Tc is unavailable, cost-prohibitive, or not specifically required, consider these alternatives:

• Ofloxacin otic 0.3% — Generic, $10–$30, first-line for AOE per clinical guidelines, safe with perforated TM
• Ciprofloxacin/dexamethasone otic (generic Ciprodex) — $50–$100, antibiotic + steroid, safe with perforated TM and tubes
• Neomycin/polymyxin B/hydrocortisone otic (generic Cortisporin Otic) — $15–$40, closest pharmacologic match to Cortisporin-Tc, contraindicated with perforated TM
• Ciprofloxacin/hydrocortisone otic (Cipro HC) — Brand-only ~$300+, contraindicated with perforated TM

For a patient-facing comparison, refer patients to our article on alternatives to Cortisporin-Tc.

Workflow Tips for Your Practice

Build a Pharmacy Contact List

Maintain a list of 3–5 pharmacies in your area that reliably stock or can quickly source Cortisporin-Tc. Update it quarterly. Include independent pharmacies, hospital outpatient pharmacies, and any chains that have proven reliable for niche otic products.

Educate Support Staff

Train your MA or front-desk staff to use Medfinder for Providers so they can check availability while you're with the patient. This parallel workflow saves time and catches availability issues before the patient reaches the pharmacy.

Set Expectations at Prescribing

A brief statement at the point of prescribing goes a long way: "This medication is brand-only and some pharmacies may not stock it. We're going to check availability now and make sure we send it to a pharmacy that has it." This manages expectations and shows the patient you're advocating for them.

Follow Up on Unfilled Prescriptions

Consider a workflow to follow up on Cortisporin-Tc prescriptions within 48–72 hours. If the patient hasn't filled it, proactively intervene with an alternative or help them locate a stocked pharmacy.

Final Thoughts

Cortisporin-Tc's limited availability creates a real clinical challenge, but it's one that can be managed with the right tools and workflows. By verifying availability before prescribing, leveraging Medfinder for Providers, setting cost expectations, and having a backup plan ready, you can ensure your patients get timely treatment — even when the first-choice medication is hard to find.

For more context on the supply situation, see our clinical briefing on the Cortisporin-Tc shortage. For information on helping patients with costs, visit our provider guide on helping patients save money on Cortisporin-Tc.