The most effective nail fungus treatment is an oral prescription antifungal called terbinafine, taken daily for about three months. It clears toenail infections in 38% to 76% of patients, which is significantly better than any topical product or home remedy. That range might sound modest, but nail fungus is notoriously stubborn, and no treatment works 100% of the time.
What works best for you depends on how severe the infection is, whether it’s on your fingers or toes, and whether you’re able to take oral medication. Here’s what the evidence actually shows for each option.
Oral Antifungals: The Most Effective Option
Terbinafine is considered first-line therapy for nail fungus because it has the highest cure rates and the lowest relapse rates of any available treatment. You take one pill daily for six weeks (fingernails) or 12 weeks (toenails). Even after you finish the medication, it takes much longer to see results. Toenails grow slowly, so it can take a year or more after starting treatment for the nail to look completely normal again. That long wait doesn’t mean the treatment failed; it means the new, healthy nail simply hasn’t finished growing in yet.
Two other oral antifungals are sometimes prescribed. Itraconazole has similar cure rates for fingernails (around 78%) but is less reliable for toenails, with success rates ranging from 14% to 63%. More importantly, a five-year study of 144 patients found that relapse rates with itraconazole were roughly double those of terbinafine: 48% of itraconazole patients saw their infection come back, compared to 21% of terbinafine patients. Fluconazole, taken once weekly, works reasonably well for fingernails (76% cure rate) but poorly for toenails (about 31%).
The main downside of oral antifungals is that they’re processed through the liver. Your doctor will check your liver function with a blood test before prescribing and may monitor it during treatment. Most people tolerate these medications without serious problems, but the liver check is a standard precaution.
Topical Prescription Treatments
If you can’t take oral medication or your infection is mild, prescription nail lacquers are an alternative, though they’re far less effective. The two main options paint directly onto the infected nail daily for about a year.
Efinaconazole (sold as Jublia) has the best topical cure rates, clearing the infection completely in 15% to 18% of patients. Tavaborole (Kerydin) is slightly less effective, with complete cure rates of 6.5% to 9.1%. To put those numbers in perspective, the placebo in those studies cleared the infection in 1% to 5% of people, so the topical drugs do work, just not nearly as well as pills. Topicals make the most sense for infections that affect less than half the nail or that haven’t reached the base where the nail grows.
Over-the-Counter and Home Remedies
You’ll find plenty of recommendations for tea tree oil, Vicks VapoRub, and other home treatments online. Some small studies have suggested mild antifungal properties from these products, but none have demonstrated cure rates anywhere close to prescription medications in rigorous trials. If your infection is very minor, a home remedy might keep it from worsening while you decide on next steps. But for an established infection with thickened, discolored nails, over-the-counter products are unlikely to clear it.
Laser Treatment: Cosmetic, Not Curative
Laser treatments for nail fungus are widely marketed, often at significant cost. What many clinics don’t make clear is that the FDA has only cleared these devices for “temporary increase of clear nail,” a cosmetic claim about appearance. No laser device has been approved for actually treating the underlying fungal infection. The FDA has specifically noted that these devices “have not demonstrated effectiveness in the treatment of fungal infections” and recommends that their labeling state they are “cleared only for improvement in nail appearance.” The nail may look better temporarily, but the fungus itself may remain.
Getting the Right Diagnosis First
About half of abnormal-looking nails aren’t actually caused by fungus. Psoriasis, trauma, aging, and other conditions can mimic the same thickened, discolored appearance. Starting a months-long antifungal regimen without confirming the diagnosis wastes time and money. The most reliable diagnostic method is a nail biopsy stained with a special dye (PAS stain), which is more accurate than the traditional approach of scraping the nail and examining it under a microscope. A fungal culture takes longer but identifies the exact species, which matters because some types of fungus don’t respond to standard treatments.
Why Nail Fungus Comes Back
Even after successful treatment, reinfection is common. In the five-year study comparing oral antifungals, even terbinafine (the best performer) saw a 23% relapse rate. The fungus that causes nail infections thrives in warm, moist environments, and your feet encounter those conditions daily.
A few practical steps reduce the odds of recurrence. Keep your feet dry, especially between the toes. Change socks when they get damp. Wear breathable shoes and rotate pairs so each has time to dry out completely. Treat athlete’s foot promptly, since the same fungus can spread from the skin to the nail. In shared wet spaces like gym showers or pool decks, wear sandals. Some dermatologists also recommend using an antifungal powder or spray inside your shoes to reduce the fungal load in footwear that may harbor spores from your original infection.
Choosing the Right Approach
For most people with confirmed toenail fungus, oral terbinafine offers the best chance of a lasting cure. Expect to take it for about three months and then wait several more months for the nail to grow out normally. If oral medication isn’t an option due to liver concerns or drug interactions, topical efinaconazole is the strongest alternative, though you should set realistic expectations given its lower success rates. Laser treatments and home remedies don’t have the evidence to support them as primary treatments.
Fingernail infections are easier to treat across the board. The nail grows faster, the infection tends to be less entrenched, and all three oral antifungals perform well, with cure rates around 75% to 78%. If your infection is limited to a fingernail, you have more flexibility in which treatment you choose.