Getting rid of a fungal toenail takes months of consistent treatment, and the approach that works best depends on how severe the infection is. Toenails grow slowly, taking up to 18 months to fully replace themselves, so even a successful treatment won’t produce a clear nail overnight. The good news: several proven options exist, ranging from prescription pills to topical solutions and even laser therapy.
Why It Takes So Long
Fungus lives in and under the nail plate, a dense layer of keratin that’s difficult for medications to penetrate. You’re not just killing the fungus; you’re waiting for a completely new, healthy nail to grow in from the base and push the damaged portion out. A big toenail can take 12 to 18 months to fully regrow. That timeline is the same whether you’re using pills, a topical solution, or a combination. Any treatment that promises results in days or weeks is not being honest about how nail biology works.
Oral Antifungals: The Most Effective Option
Prescription pills are the first-line treatment for moderate to severe fungal toenails. Terbinafine is the most commonly prescribed, with clinical cure rates between 38% and 76%. Itraconazole is the main alternative, though its cure rates are lower (14% to 63%) and it has significantly higher relapse rates. A five-year study found that 48% of patients treated with itraconazole experienced a clinical relapse, compared to 21% with terbinafine.
A typical terbinafine course lasts about three months for toenails. During that time, your doctor will likely order blood work before you start and again about a month in to check liver enzymes. Asymptomatic liver enzyme elevations occur in fewer than 2% of patients on oral antifungals, and half of those cases resolve simply by stopping the medication. The risk is real but small, and routine monitoring catches problems early.
After finishing the pills, you’ll still need to wait for the nail to grow out completely. It’s common to finish a three-month course and not see a fully clear nail for another six to twelve months.
Prescription Topicals: Better for Mild Cases
If the infection is limited to a small portion of the nail, or if you can’t take oral medication, prescription topical solutions are an option. All of them require daily application for 48 weeks, which is a serious commitment.
The most effective prescription topical is efinaconazole 10% solution, with complete cure rates of 15% to 18%. Tavaborole 5% solution comes in at 6.5% to 9.1%, and ciclopirox 8% lacquer at about 7%. Those numbers are dramatically lower than oral medication, and they reflect how hard it is for any topical to penetrate the nail plate. Lab testing confirms this: efinaconazole maintains nearly all its antifungal activity when it has to pass through a human toenail, while ciclopirox loses most of its potency. That’s why efinaconazole outperforms the others despite all three being applied the same way.
Topicals work best when combined with other strategies. Filing down the thickened nail before application helps the solution reach the fungus. Some doctors pair a topical with a short course of oral medication to attack the infection from both directions.
Over-the-Counter Products
Drugstore antifungals containing tolnaftate or undecylenic acid are marketed for nail fungus, but their ability to penetrate the nail is significantly weaker than prescription topicals. In head-to-head lab testing, all OTC products produced substantially smaller zones of fungal inhibition through human nail samples compared to efinaconazole and tavaborole. These products may help with fungal skin infections around the nail, but expecting them to clear an established nail infection is unrealistic.
One surprising performer is mentholated ointment (Vicks VapoRub). In a small clinical study of 18 participants who applied it daily for 48 weeks, about 28% achieved a complete cure and another 56% saw partial clearance. Only 17% had no improvement. The active ingredients, including thymol, menthol, and eucalyptus oil, have demonstrated antifungal properties in lab settings. It’s not a substitute for prescription treatment in serious cases, but for a mild infection or as a complement to other therapy, the cost and risk are minimal.
Laser Treatment
Laser therapy targets the fungus with concentrated light energy, and it’s increasingly offered by dermatologists and podiatrists. A meta-analysis found an overall efficacy of about 63%, which is moderately lower than oral terbinafine (about 85%) or itraconazole (about 80%) when measured by lab-confirmed fungal clearance. The main appeal is avoiding the systemic side effects of oral medication.
Not all lasers perform equally. Long-pulse Nd:YAG lasers achieved a 71% mycological cure rate, while short-pulse versions dropped to just 21%. CO2 lasers showed variable results depending on the technique used. Laser treatment typically requires multiple sessions, is rarely covered by insurance, and can cost several hundred dollars per session. It’s a reasonable choice if oral medication isn’t safe for you, but it’s not the most effective standalone option.
Nail Removal
For severely thickened nails that don’t respond to medication, removing the nail plate can help. This is done either surgically or chemically, often using a 40% to 50% urea compound that softens and dissolves the nail over a couple of weeks. Nail removal is almost always used alongside oral antifungal therapy, not as a replacement for it. Removing the nail gives medication direct access to the nail bed where the fungus lives, improving cure rates for stubborn infections. The nail will regrow over the following 12 to 18 months.
Recurrence after any treatment is common, with reported rates ranging from 10% to 53%. This isn’t necessarily a failure of the original treatment. Reinfection from the same environmental sources is just as likely as a true relapse.
Make Sure It’s Actually Fungus
About half of abnormal-looking toenails are caused by something other than fungus. Nail psoriasis is the most common lookalike and produces some overlapping symptoms like thickening and discoloration. A few features help distinguish them: psoriasis typically causes small pits in the nail surface (more than 10 per nail strongly suggests psoriasis), salmon-colored or oil-drop spots on the nail bed, and splinter hemorrhages that look like tiny dark lines running lengthwise. Psoriasis also tends to wax and wane, while fungal infections steadily worsen.
Fungal nails more often show a ragged, fringed border where the discoloration meets healthy nail, and sometimes develop a yellow spike-shaped mass called a dermatophytoma. White, chalky patches on the nail surface point to a specific type called white superficial onychomycosis. Your doctor can confirm the diagnosis with a nail clipping sent for culture or microscopy, which is worth doing before committing to months of treatment.
Preventing Reinfection
Treating the nail without addressing the environment is a setup for reinfection. Fungal spores survive in shoes, and decontaminating your footwear matters. UV-C light (the shortest wavelength of ultraviolet) is the most effective shoe sanitization method studied. Exposure at 280 nm wavelength completely prevented regrowth of the most common nail fungus species after two weeks of incubation in lab conditions. Longer UV wavelengths and sanitization putties did not show reliable antifungal effects. Portable UV-C shoe sanitizers are widely available for home use.
Beyond shoes, keep your feet dry, rotate footwear to allow drying between wears, wear moisture-wicking socks, and protect your feet in shared wet environments like pool decks and gym showers. If you had a confirmed fungal infection, consider replacing old shoes that were worn frequently during the infection period, since they may harbor spores that reintroduce the fungus to your newly cleared nails.