Getting rid of nail fungus takes months of consistent treatment, and the approach that works best depends on how severe the infection is. Toenails grow at roughly 1.6 mm per month, meaning a full toenail replacement takes up to 18 months. Fingernails grow faster (about 3.4 mm per month) and can fully regrow in around six months. Because the fungus lives in and under the nail, you’re essentially waiting for a healthy nail to replace the infected one while preventing the fungus from spreading into new growth.
Confirming It’s Actually Fungus
Thick, discolored, or crumbly nails aren’t always caused by fungus. Psoriasis, trauma, and other conditions can look nearly identical. A doctor can clip or scrape a small piece of the affected nail and test it. The most reliable method is a nail biopsy with a special stain, which catches about 92% of true infections. A standard culture (growing the sample in a lab) is less sensitive, detecting only about 59% of cases, but it’s useful for identifying the exact species of fungus. Getting a confirmed diagnosis before starting treatment saves you from months of medication that won’t help if fungus isn’t the cause.
Oral Antifungals: The Most Effective Option
Oral antifungal medication is the first-line treatment for moderate to severe nail fungus. It works from the inside out, reaching the nail bed through the bloodstream and embedding in the nail as it grows.
Terbinafine is considered the most effective oral option. For toenails, a typical course is 12 weeks of daily pills, with clinical cure rates between 38% and 76%. For fingernails, a shorter six-week course achieves cure rates around 75%. A five-year study of 144 patients found that terbinafine had significantly lower relapse rates than itraconazole (the main alternative): 21% relapse versus 48% for itraconazole in patients with severe disease.
Itraconazole is sometimes used instead, particularly for fingernail infections, where it achieves cure rates around 78%. For toenails, its results are more variable, ranging from 14% to 63%. It can be taken continuously or in “pulse” cycles of one week on, three weeks off.
Both medications are processed by the liver. For healthy adults under 65 with no pre-existing liver or blood conditions, routine blood monitoring during treatment is generally not needed. If you have a history of liver problems, your doctor will likely check liver enzymes before and during the course.
Prescription Topical Treatments
Topical antifungals applied directly to the nail are an option for mild infections, especially when the fungus hasn’t spread to the root of the nail. The tradeoff: they’re much less effective than oral medication, but they also carry fewer side effects. All prescription topicals require daily application for 48 weeks (nearly a full year).
The strongest prescription topical achieves complete cure rates of 15% to 18%. A second option cures roughly 6.5% to 9% of cases, and ciclopirox nail lacquer cures about 7%. Those numbers sound low, and they are. Topicals struggle because the nail plate acts as a physical barrier, preventing medication from reaching the fungus underneath. Filing down the nail surface before applying the medication helps it penetrate more deeply, which is why dermatologists often recommend trimming and thinning the nail as part of the routine.
Topicals work best when combined with nail debridement, a procedure where a dermatologist uses a specialized tool to reduce the thickness of the nail. This removes layers of infected material and gives the medication better access to the remaining fungus.
What About Home Remedies?
Tea tree oil is the home remedy with the most research behind it. Studies of twice-daily application over six months reported clinical cure rates between 27% and 78.5%, with one randomized trial of 177 patients showing results comparable to a standard over-the-counter antifungal cream. That’s a wide range, and results likely depend on severity. For a single nail with mild discoloration, tea tree oil is a reasonable low-risk option to try before pursuing prescription treatment.
Vicks VapoRub has shown some promise in small pilot studies due to its antifungal ingredients (thymol, camphor, and eucalyptus oil), but the evidence is limited. Vinegar soaks and other popular suggestions lack clinical data. None of these remedies will reliably clear a thick, widespread infection.
Laser Treatment
Laser treatment for nail fungus uses focused light energy to heat and kill the fungus within the nail. It sounds appealing, but the evidence is mixed. Initial results can look promising, with the nail appearing to improve, but sustained cures have proven difficult to achieve. Success also varies depending on the type of laser used. Laser treatment is rarely covered by insurance and can cost several hundred dollars per session, with multiple sessions typically needed.
Why Treatment Takes So Long
Even after the fungus is killed, your nail won’t look normal right away. The damaged, discolored portion of the nail has to physically grow out and be replaced by new, healthy nail. For fingernails, that’s roughly six months. For toenails, it can take 12 to 18 months. This is why many people feel treatment “isn’t working” when it actually is. The medication’s job is to clear the fungus so that new growth comes in healthy. You’ll notice improvement starting at the base of the nail, with the discolored portion gradually moving toward the tip as you trim it away.
One type of nail fungus responds faster than others. White superficial onychomycosis, where the fungus grows on top of the nail rather than underneath, can sometimes be treated by scraping away the infected surface and applying antifungal medication directly. This type is less common but easier to address.
Preventing It From Coming Back
Nail fungus has a frustrating tendency to recur. The same warm, damp environment that caused the initial infection will invite it back. Prevention requires changing the conditions your feet live in daily.
- Rotate your shoes. Give each pair at least 24 hours to dry out between wears.
- Wear moisture-wicking socks and change them if they get sweaty during the day.
- Choose breathable footwear made of canvas or mesh when possible.
- Use antifungal powder or spray in your shoes and on your socks before putting them on.
- Wear sandals or flip-flops in locker rooms, shared showers, gyms, and pool areas.
- Keep nails short and trimmed straight across. Fungi and bacteria collect under longer nails.
- Disinfect your nail clippers after every use and never share them.
Treat athlete’s foot immediately if it develops. The cracked, peeling skin between your toes is caused by the same types of fungi, and the infection can easily spread to your nails. If anyone in your household has nail fungus or athlete’s foot, they should be treated at the same time to avoid passing it back and forth.
When starting treatment, either throw away the shoes you’ve been wearing or disinfect them thoroughly. Wash all socks in hot water. Fungal spores survive in fabric and shoe linings, and wearing contaminated footwear during treatment can reintroduce the infection before it has a chance to clear.