Nail Fungus: Topical or Tablets, and How Long It Really Takes

At a glance

What is it? A fungal infection of the nails, mostly on the toenails.
How common? Very common, especially with increasing age.
Treatment Lacquer for mild cases, tablets (terbinafine) for stronger ones, often combined.
Realistic duration Months to over a year, a toenail takes about 9 to 12 months to grow out.
Important It does not go away on its own, and sticking with it decides success.
ICD-10 B35.1 (tinea unguium)

What is nail fungus?

Nail fungus (medically onychomycosis) is a fungal infection of the nails. The toenails are affected much more often than the fingernails. Usually so-called dermatophytes are the cause, the same pathogens as in athlete's foot, which often coexists or comes first.

Nail fungus is very common and increases with age. It practically never disappears on its own, but slowly spreads further. The good news: with the right, consistent treatment it can be brought under control in most cases. But it takes patience.

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Symptoms: typical nail changes

Nail fungus shows itself through typical changes to the nail, which usually start at the tip or edge and slowly spread towards the nail root:

  • thickened nails and discoloration, whitish, yellowish or brownish.
  • brittle, crumbly or distorted nails.
  • crumbly material under the nail.
  • a separation of the nail from the nail bed.

More on changes to the nail and their possible causes: Nail changes. Often there is athlete's foot at the same time, with itching and scaly skin between the toes. More on this: Athlete's foot.

Important: not every nail change is a fungus. Psoriasis, injuries or simply getting older can look similar too. That is why the diagnosis should be confirmed before a long treatment.

Diagnosis: confirm first, then treat

Before treating for months, it is worth making sure that there really is a fungus. Because only about half of all suspicious nails are actually affected by fungus. For this, the doctor takes some nail material and has it examined:

  • a direct examination under the microscope.
  • a fungal culture, which shows which pathogen is present (this influences the choice of medicine).
  • increasingly a quick gene test (PCR) too.

Identifying the pathogen matters, because the best medicine depends on it. That way you avoid doing the wrong thing for months.

Topical or systemic? The decision tree

Whether a nail lacquer is enough or tablets are needed depends above all on how badly the nail is affected and whether the nail root (matrix) is involved. Roughly, it can be classified like this:

Situation Recommended treatment
Mild involvement: only the nail tip or edge, less than about half the nail, nail root free, few nails topical: antifungal nail lacquer (e.g. with ciclopirox or amorolfine), often with urea to soften the nail
Stronger involvement: more than about half the nail, nail root affected, several nails, or when the lacquer does not work systemic: tablets, for the most common pathogens usually terbinafine
Moderate to severe involvement usually a combination of tablets and lacquer, which works best

Scroll the table sideways →

What also determines the choice: how much of the nail and how many nails are affected, whether the nail root is involved, which fungus is present and factors such as age, liver values and other medicines. Terbinafine is the first choice for the most common pathogens (dermatophytes). Before tablet treatment, the liver values are usually checked and possible interactions considered. That is why the decision for tablets belongs in medical hands.

How long does it really take?

The most important and most honest message first: a nail fungus treatment takes a long time, much longer than some advertising promises. The reason is simple, nails grow slowly.

  • A toenail takes about 9 to 12 months to grow out completely once. Only then is a healthy nail fully visible.
  • A tablet treatment also takes time: for toenails the tablets are often taken for about 3 months, but the healthy nail then keeps growing out over many more months.
  • A nail lacquer often has to be applied consistently for 6 to 12 months, for the terbinafine lacquer for example first daily, then weekly.
What advertising likes to conceal Quick results in a few weeks are unrealistic. The most common reason a treatment fails is that it is stopped too early, especially when the nail does not look better yet. Those who keep going have the best chances. And even after a successful treatment, nail fungus unfortunately comes back relatively often, which is why prevention matters.
Reminders

This is exactly where most fail: stopping too early.

brite reminds you reliably of the lacquer or tablet through all the months, even when the nail does not look better yet. Plus an interaction check for tablets like terbinafine and a record so you can see the progress. So your patience is not wasted.

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Avoiding a relapse

Nail fungus comes back relatively often after successful treatment. With a few measures you lower the risk:

  • consistently treat an existing athlete's foot too, because it is often the source.
  • dry your feet well, including between the toes, and wear breathable shoes and changing socks.
  • wear bathing shoes in swimming pools, saunas and communal showers.
  • change and disinfect shoes and socks regularly, and do not share towels and nail scissors.
  • with diabetes, check your feet regularly or have them checked.

When to see a doctor

A visit to a dermatology practice is sensible to confirm the diagnosis, choose the right medicine and, if needed, prescribe tablets. Precisely because the treatment takes a long time, the right start is worthwhile, instead of trying something on the off chance for months.

Especially important with diabetes and circulation problems If you have diabetes, a weakened immune system or circulation problems, you should not treat nail and athlete's foot yourself, but have it assessed by a doctor early. Foot infections can be more serious with these conditions. Also contact a practice promptly if a toe becomes red, swollen, warm and painful, which can be signs of an additional bacterial infection.

Stick with the long treatment with brite

Whether daily lacquer, weekly lacquer or the daily tablet over months: brite helps you stay on it and keep an eye on the progress.

  • Application reminders: for lacquer and tablet, through all the months, even when it is easy to forget.
  • Progress in view: record how the nail grows out, which motivates you to keep going.
  • Interaction check: important with tablets like terbinafine and your other medicines.
  • Medication plan: all medicines in one place, ready for the next appointment.
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brite app on a smartphone: medication plan and reminders

Frequently asked questions

No. Nail fungus practically never heals on its own, but slowly spreads further. Without treatment it persists.

An antifungal nail lacquer is often enough for mild involvement, when only the nail tip and less than about half the nail is affected and the nail root is free. With stronger involvement, an affected nail root or several nails, tablets (often terbinafine) are usually needed.

A long time. A toenail takes about 9 to 12 months to grow out. Tablets are often taken for about 3 months for toenails, and the healthy nail then keeps growing out for many more months. A nail lacquer often takes 6 to 12 months.

Because nails grow slowly. Even when the fungus is killed, the healthy nail only becomes visible once it has grown out. Quick results in a few weeks, as some advertising promises, are unrealistic.

Terbinafine is the first choice for the most common pathogens and is usually well tolerated. Because it can rarely strain the liver and interact with other medicines, it belongs in medical hands, often with monitoring of the liver values.

Yes, that is important. Athlete's foot is often the source of the nail fungus. If it is not treated as well, the nail fungus easily comes back.

No. Only about half of suspicious nails are actually affected by fungus. Psoriasis, injuries or getting older can look similar too. That is why the diagnosis should be confirmed.

Yes. Keeping your feet dry, treating athlete's foot, wearing bathing shoes in swimming pools, changing socks and shoes and not sharing towels lower the risk.

Related topics

Quellen

  1. DDG (Deutsche Dermatologische Gesellschaft) und Deutschsprachige Mykologische Gesellschaft: S1-Leitlinie „Onychomykose“ (AWMF 013-003, Version 5.1, 2022). register.awmf.org/de/leitlinien/detail/013-003
  2. IQWiG / gesundheitsinformation.de: Nagelpilz. gesundheitsinformation.de
  3. DDG / derma.de: Patienteninformationen zu Nagelpilz. derma.de
  4. Deutsche Haut- und Allergiehilfe e. V.: Informationen zu Nagelpilz. dha-allergien.de
  5. Hautärzte im Netz (BVDD): Informationen zu Nagelpilz. hautaerzte-im-netz.de
Important note: This article is for general information and does not replace medical advice, diagnosis or treatment. Tablets against nail fungus are prescription only and can have interactions. With diabetes, circulation problems or a weakened immune system, you should have nail fungus assessed by a doctor early. Last updated: June 2026.