Comprehensive medication guide to Acetic Acid including estimated pricing, availability information, side effects, and how to find it in stock at your local pharmacy.
Estimated Insurance Pricing
$0–$15 copay for Tier 1 generic; $10–$30 for Tier 2 on most commercial plans. Medicare Part D typically covers it at the lowest cost-sharing tier.
Estimated Cash Pricing
$24–$40 retail for generic acetic acid otic 2% (15 mL); as low as $14.65 with a GoodRx coupon at participating pharmacies.
Medfinder Findability Score
45/100
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Acetic acid otic solution (2%) is a prescription antiseptic ear drop used to treat otitis externa — the outer ear infection commonly known as swimmer's ear. It is also available in a combination product with hydrocortisone (Acetasol HC, Vosol HC) for cases requiring both antimicrobial and anti-inflammatory treatment.
The original brand name was VoSol, which was discontinued in the U.S. market. The FDA confirmed in May 2025 that VoSol's withdrawal was not for safety or effectiveness reasons. FDA-approved generic versions of acetic acid otic remain commercially available, though pharmacy stock can be inconsistent due to limited manufacturers and low market demand.
Acetic acid otic is approved for adults and children aged 3 years and older. It is not effective for inner ear infections (otitis media) and should not be used if the eardrum is perforated.
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Acetic acid otic works primarily by lowering the pH of the ear canal to approximately 3 — a highly acidic environment that is inhospitable to the bacteria and fungi that cause swimmer's ear. This pH-based mechanism is bacteriostatic (stops bacterial growth) and fungistatic (stops fungal growth), allowing the immune system to clear the remaining infection.
Beyond pH reduction, acetic acid molecules directly penetrate bacterial cell membranes, disrupting energy production and protein synthesis within the bacteria. The formulation also contains propylene glycol diacetate, which absorbs moisture from the ear canal — a key factor in resolving swimmer's ear since a moist environment promotes microbial growth.
Unlike antibiotic ear drops, acetic acid's non-specific mechanism means it does not contribute to antibiotic resistance. This is an advantage for mild-to-moderate otitis externa cases where broad-spectrum antibiotics are not necessary.
2% — otic solution
15 mL bottle; 3-5 drops in affected ear 3-4 times daily for adults; 3-4 drops for children
1%/2% — otic solution (with hydrocortisone)
Combination product (Acetasol HC) — 10 mL bottle; same dosing frequency
Acetic acid otic can be difficult to find at many retail pharmacies in 2026. Despite not being on the FDA's official shortage list, the combination of brand discontinuation (VoSol), a small number of generic manufacturers, low per-unit margins, and seasonal demand spikes in summer means that many chain pharmacies keep minimal or no stock.
Independent pharmacies are more likely to carry it or be willing to special-order it within 24–48 hours. Mail-order pharmacies and Amazon Pharmacy can also source it for non-urgent prescriptions. If you need the medication quickly, calling multiple pharmacies can be time-consuming.
The most efficient way to find acetic acid otic in stock near you is to use medfinder — a paid service that calls pharmacies near you to check availability and texts you the results, saving you hours of phone calls.
Acetic acid otic is not a controlled substance and has no special prescribing restrictions. Any licensed healthcare provider with prescribing authority can write a prescription for it.
Primary care physicians (PCPs) — family medicine and internal medicine doctors routinely prescribe this for swimmer's ear.
Pediatricians — for children aged 3 years and older.
ENT specialists (otolaryngologists) — for complex or recurrent ear infections.
Nurse practitioners (NPs) and physician assistants (PAs) — prescribe independently in most states.
Urgent care providers — excellent same-day option for first episodes of swimmer's ear.
Acetic acid otic can be prescribed via telehealth in most states. Swimmer's ear (otitis externa) is one of the most telehealth-friendly ear conditions because it is typically diagnosed based on clinical history and symptoms. Major telehealth platforms including Teladoc, MDLive, and Amwell can evaluate and prescribe for this condition.
No. Acetic acid otic solution is not a controlled substance and has no DEA (Drug Enforcement Administration) scheduling. It is a standard prescription medication with no special prescribing, dispensing, or refill restrictions associated with controlled substance status.
Any licensed healthcare provider — including primary care physicians, nurse practitioners, physician assistants, pediatricians, urgent care providers, and ENT specialists — can prescribe acetic acid otic without any special DEA authorization or controlled substance prescription requirements. It can also be prescribed during telehealth visits in most states.
Acetic acid otic is very well tolerated. The most common side effect is:
Transient stinging or burning in the ear canal upon application, especially early in treatment when inflammation is most severe.
Mild local irritation at the application site (rare).
Signs of allergic reaction: hives, rash, swelling of face/throat, difficulty breathing.
Worsening ear pain after 48+ hours of treatment.
New hearing loss or fever — may indicate infection spread, requires immediate evaluation.
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Ofloxacin Otic 0.3%
Fluoroquinolone antibiotic ear drop; first-line alternative for bacterial swimmer's ear. Safe with perforated eardrum. Available generic, $10-$25.
Ciprodex (Ciprofloxacin/Dexamethasone)
Antibiotic + anti-inflammatory combination. More effective for severe cases. Widely available but more expensive ($100-$200 without insurance).
Hydrocortisone/Acetic Acid (Acetasol HC)
Combination of acetic acid with hydrocortisone steroid for added inflammation relief. Similar mechanism to plain acetic acid otic.
Cortisporin Otic
Neomycin/polymyxin B/hydrocortisone combination. Effective but should only be used with intact eardrum due to neomycin ototoxicity risk. Generic $20-$60.
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Other Ear Drop Products
minorUsing concurrent ear preparations may neutralize acetic acid's pH effect or increase irritation. Use only as directed.
Systemic Medications (general)
minorNo known systemic drug interactions due to negligible systemic absorption from topical otic application.
Acetic acid otic solution is a safe, effective, and affordable treatment for swimmer's ear that has been used for decades. Its non-antibiotic mechanism of action — lowering ear canal pH to inhibit bacterial and fungal growth — makes it an excellent choice for uncomplicated otitis externa, with no contribution to antibiotic resistance.
The primary challenge with acetic acid otic in 2026 is pharmacy availability. With the VoSol brand discontinued and only a limited number of generic manufacturers, stock at local pharmacies is inconsistent. Patients should be prepared to search across multiple pharmacies, especially in summer months when swimmer's ear cases peak.
If you're having difficulty locating acetic acid ear drops, medfinder can help. medfinder calls pharmacies near you to check which ones have your medication in stock and texts you the results — so you can get treated quickly without the frustration of calling pharmacy after pharmacy.
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Our medication guides are researched and written to help patients make informed decisions. All content is reviewed for accuracy and updated regularly. Learn more about our standards
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