By Dr. Evan Lewis, PhD
Last updated: 9 August 2026
Toenail fungus is one of the most common conditions presented to podiatrists, and one of the most frustrating to manage. Not because good options do not exist, but because the nail grows slowly, care requires months of consistent application, and patients face a range of options with genuinely different tradeoffs depending on their situation.
This article is for patients. If you have seen, or are considering seeing, a podiatrist for toenail fungus, here is what the conversation will typically cover: the three main clinical approaches, what the evidence says about each one, how compliance shapes real-world outcomes, and what questions are worth bringing to your appointment.
Why Is Toenail Fungus So Common?
Because the fungi that cause it thrive in exactly the conditions a closed shoe creates, and because the nail itself is a protected place for them to sit. Dermatophyte fungi are responsible for the majority of toenail infections, and they favour warm, moist, enclosed environments.
Exposure is easy to come by. Spores persist on shared surfaces: gym floors, pool surrounds, locker rooms, communal showers. Two clinical facts make the picture worse. StatPearls notes that "wearing occlusive shoes for extended periods predisposes patients to dermatophyte infections" and that the risk rises with excessive sweating. And a 2022 scoping review found household transmission of onychomycosis and dermatophytosis in 44 to 47% of the households studied, which is why one treated foot in a shared house often is not the end of it.
Behaviour matters just as much. Toenail fungus is rarely painful early on, so many people live with it for years before seeking help. By the time it reaches a podiatrist, it may involve several nails and have been present for two to five years. That is not exceptional; it is the most common presentation pattern podiatrists see.
What Are the Three Options a Podiatrist Will Discuss?
Oral antifungal tablets, prescription topical solutions, and non-prescription routines including aqueous iodine. Which one comes up first depends almost entirely on how severe the nail is and what your health history allows.
Option 1: Oral Antifungals (Terbinafine / Lamisil)
Oral antifungal therapy, most commonly terbinafine, marketed as Lamisil, is the highest-efficacy option currently available. It is what most patients receive when a podiatrist is managing a moderate to severe infection.
How it works: Terbinafine is systemic. Taken as a daily pill, it is absorbed through the gut and reaches the nail through the bloodstream via the nail matrix, where new nail is formed. That delivery route lets it reach organisms inside the nail in a way topicals struggle to do through an intact nail plate.
Effectiveness: CADTH's review of efinaconazole states that mycologic cure rates with oral agents such as terbinafine and itraconazole "are reported to be higher" than the topical figures, and that oral antifungal therapy is more effective over a shorter treatment duration than topical efinaconazole. It is the strongest option on the table.
Duration: A standard toenail course is 90 days, 12 weeks of daily pills. The pills finish long before the nail looks different, which is the source of a great deal of patient disappointment.
Considerations: It is not appropriate for everyone. It requires liver function testing before and sometimes during treatment, because the drug is metabolised through the liver and rare cases of hepatotoxicity have been reported. It interacts with several common medications, and it is not used in pregnancy or in patients with existing liver conditions. Nausea and abdominal discomfort occur in a subset of patients. The screening exists to identify the small group for whom it is not suitable.
Option 2: Prescription Topicals (Jublia / Efinaconazole; Penlac / Ciclopirox)
For patients who cannot take oral antifungals, or who prefer to start topically, prescription-strength topicals are the next tier.
How they work: They are applied to the nail surface and penetrate the plate to reach organisms below. Jublia (efinaconazole 10%) uses a formulation designed to penetrate the nail better than earlier topicals. Penlac (ciclopirox) uses a lacquer that builds on the nail surface over time.
Effectiveness: This is where the number you are quoted matters enormously. In Jublia's pivotal trials, mycologic cure was 55.2% and 53.4% at 52 weeks, but complete cure, the composite of clinical and mycologic cure, was 17.8% and 15.2%. CADTH notes that mycologic cure alone may overestimate treatment effect. If someone quotes you "over 50%", ask which of those two numbers they mean.
Duration: 48 weeks of daily application. Nearly a full year of painting a nail, with no day-to-day feedback that anything is happening.
Cost: This is the most significant practical barrier for many people. Jublia requires a prescription, which requires a podiatrist or dermatologist visit, and what you pay depends on your pharmacy and your coverage. Ask for the price before you leave the appointment rather than at the till. Partly for this reason, some podiatry offices dispense their own non-prescription brush-on systems instead; we have compared the podiatrist-dispensed option Tolcylen with a daily iodine routine.
Option 3: OTC and Natural Options, Including Aqueous Iodine
For mild to moderate nails, and increasingly as a starting point before escalating, many patients discuss non-prescription options with their podiatrists. Among these, aqueous iodine has the longest published history (for side-by-sides with drugstore options, see how Kerasal compares with iodine and Fungi-Nail vs iodine).
Three published papers describe iodine applied to onychomycosis-affected nails:
Davidson (CMAJ, 2006) is a single case. A retired physician applied 2.5% iodine tincture to his own affected toenail once a day. Normal-looking nail appeared at the base within about two weeks and the affected portion grew outward from there, at a total cost of $3.27. The author was explicit that this was one case. PMC1569938.
Capriotti and Capriotti (International Medical Case Reports Journal, 2015) is also a single patient: severe, treatment-resistant onychomycosis, 1% povidone-iodine in a DMSO vehicle twice daily, nail cleared with a negative culture at the 24-week visit. PMC4599634.
Capriotti, Stewart, Pelletier and Capriotti (Clinical Research and Trials, 2016) is the largest of the three: a retrospective chart review of 13 patients on the same preparation, in which 8 of 13 (62%) had negative cultures at 24 weeks. These are findings about iodine as an ingredient, in the preparations each research group used, not about any retail product.
What the research says about how iodine behaves: A 2020 review in Antimicrobial Agents and Chemotherapy reports that iodine "rapidly penetrates into microorganisms and oxidizes key proteins, nucleotides, and fatty acids", and notes no observed link between its use and resistance development. That is a multi-target mechanism, which is different from the azole antifungals, which act on a single enzyme. Iodine has been used on skin since the 1800s.
Cost and accessibility: Aqueous iodine formulations like IodinePure EZ Clear Nails are available without a prescription and without a clinic visit to begin. The routine is a 5 to 7 minute soak three or four times a week, which carries solution under the free edge and into the nail folds, plus a twice-daily spray between soaks.
Best suited for: mild to moderate nails as a first-line daily routine; people who prefer to avoid medications; and as a daily maintenance routine after prescription treatment. For moderate to severe or persistent nails, the podiatrist conversation about prescription options still matters.
Why Does Compliance Decide the Outcome?
Because every option on this page takes longer than most people are told, and the ones people abandon do not work. Across all three approaches, the variable with the largest real-world impact is often not the treatment. It is whether the routine survives month four.
Here is the number that governs it. Toenails grow at roughly 1.62 mm per month (Yaemsiri, JEADV 2010). The widely quoted 3 mm a month is the fingernail rate, close to double. A great toenail is 20 to 25 mm from base to tip, so an affected nail needs 12 to 18 months of regrowth from the matrix outward before a fully clear nail emerges.
That arithmetic reframes every course length above. A 12-week course of oral terbinafine, or Jublia's 48 weeks, both finish before the nail has finished growing. The treatment window and the visible-result window are not the same window, and patients who are not told that quit somewhere in the gap.
Recurrence is part of the same picture. CADTH's review notes that recurrence rates of 35.7% and 11.9% have been reported following oral itraconazole and terbinafine respectively, and that no recurrence data was available for efinaconazole at all. Finishing a course is not the same as being done.
In trials, compliance is controlled and monitored. In life, it is the deciding variable. An option used consistently for a year will out-perform a better option abandoned in week nine, which is the practical reason cost and convenience are clinical questions and not just financial ones.
What Should You Ask Your Podiatrist?
Ask about severity, candidacy and what progress should look like on a calendar. These six questions cover it:
- How severe is this? Which nails are involved, and to what degree?
- Based on that severity, what do you recommend as a starting point?
- Am I a candidate for oral terbinafine? If not, why not?
- Would a daily aqueous iodine routine be appropriate for me, as a starting point or alongside?
- How many millimetres of clear new nail should I expect at 30, 60 and 90 days?
- What would tell you the routine is working, and when would we reassess?
Frequently Asked Questions
Should I see a podiatrist for toenail fungus?
For an early-stage nail affecting one toe, many people reasonably start with a non-prescription routine before booking. If it is moderate to severe, affects multiple nails, has been there more than a year, or involves significant thickening or separation, a podiatrist gives you assessment, a confirmed diagnosis and access to prescription options. If you have diabetes or a condition affecting your immune system or circulation, see a podiatrist for any foot problem and do not self-treat.
What do podiatrists prescribe for nail fungus?
Most commonly oral terbinafine (Lamisil) for moderate to severe nails, 12 weeks of daily pills, and prescription topicals including Jublia (efinaconazole 10%) and Penlac (ciclopirox) where oral therapy is not suitable. The choice depends on severity, health history, contraindications and preference. Many podiatrists also support a daily aqueous iodine routine as part of at-home care, particularly for mild nails and as maintenance after a prescription course.
Is iodine as effective as Jublia?
The two are not evidenced on the same footing, and it is worth being clear about that. Jublia has registration trials behind it: mycologic cure of 55.2% and 53.4% at 52 weeks, complete cure of 17.8% and 15.2%. Iodine has three published papers describing improvement in fungal nails, and they are case reports and a chart review rather than registration trials. What iodine has is a well-described mechanism in the literature, use on skin going back to the 1800s, and a cost and access profile that makes daily use over a year realistic, which matters in a condition where compliance decides so much.
Can I use iodine alongside prescription treatment?
Many patients do, and many podiatrists support it. Aqueous iodine and topical prescription antifungals work through different mechanisms and there are no known interactions between them. Some people use a prescription topical while keeping a soak and spray routine going; others continue the iodine routine as maintenance after finishing oral terbinafine. Raise it with your podiatrist in the context of your own situation.
How long does toenail fungus care take?
Expect 12 to 18 months before a completely clear nail emerges, whichever option you choose. Toenails grow at roughly 1.62 mm per month and a great toenail is 20 to 25 mm long, so the affected nail has to physically grow out and be replaced from the matrix. Active courses, whether terbinafine at 12 weeks, Jublia at 48 weeks, or a daily iodine routine, run on their own clock; visible clearance follows nail growth regardless. Clear new growth at the base is usually visible around 60 to 90 days, and that band is what you judge progress on.
Start the 90-Day Protocol
IodinePure EZ Clear Nails delivers aqueous iodine, the ingredient described in the three published papers above, to the nail through a soak that reaches under the free edge and into the folds, plus a twice-daily spray. No prescription required. Two ingredients.
References
- CADTH. Common Drug Review: Efinaconazole (Jublia). NCBI Bookshelf NBK543976.
- Yaemsiri S, Hou N, Slining MM, He K. Growth rate of human fingernails and toenails in healthy American young adults. JEADV. 2010.
- Lepelletier D, Maillard JY, Pozzetto B, Simon A. Povidone Iodine: Properties, Mechanisms of Action, and Role in Infection Control. Antimicrob Agents Chemother. 2020;64(9).
- Jazdarehee A, et al. Transmission of Onychomycosis and Dermatophytosis between Household Members: A Scoping Review. J Fungi. 2022;8(1):60.
- StatPearls. Tinea Pedis. NCBI Bookshelf NBK470421.
- Davidson R. An economical cure. CMAJ. 2006. Single case.
- Capriotti K, Capriotti JA. Onychomycosis treated with a dilute povidone-iodine/DMSO preparation. Int Med Case Rep J. 2015. Single patient.
- Capriotti K, Stewart KP, Pelletier JP, Capriotti J. Treatment of onychomycosis with dilute topical povidone-iodine in a dimethylsulfoxide solvent system. Clinical Research and Trials. 2016. 13 patients.
