Laser or oral terbinafine for fungal toenails: evidence, risks and who each suits

Short answer (as of 4 November 2026): for confirmed fungal toenail infection, the 2026 British Association of Dermatologists (BAD) guideline recommends oral terbinafine as a first-line option for adults with no history of liver disease. The same guideline makes no recommendation for laser on its own, because the evidence of benefit is not yet strong enough. That does not mean laser can never help. It means the evidence is thinner and less consistent, so laser is a decision to make with open eyes rather than a proven equal to tablets.

What is current: the 2026 BAD guideline

The BAD published an updated fungal nail infection guideline in the British Journal of Dermatology in October 2026, replacing its 2014 version. As we read it:

• Terbinafine is a first-line option for adults without liver disease, at 250 mg a day for 12 to 16 weeks for toenails. Your prescriber sets the actual dose and duration.
• It also advises terbinafine for people with diabetes who have a dermatophyte infection, and for people with weakened immunity.
• It says there is "insufficient evidence of efficacy to recommend laser monotherapies" for fungal nail infection.
• Laboratory confirmation of the infection should be obtained before treatment starts.
• It suggests considering a topical antifungal alongside physical treatments, and a topical alongside tablets for some people.

The guideline was advance-published and we have not seen every appendix, so the evidence certainty ratings are not reproduced here.

Laser or terbinafine at a glance

	Oral terbinafine	Laser
Who prescribes or provides	GP or other prescriber	Private clinics; not usually NHS-funded
Guideline position (BAD 2026)	First-line option for adults without liver disease	No recommendation as monotherapy: insufficient evidence
Evidence	Strongest of the options for dermatophyte infection	Mixed; small studies, varied protocols, few head-to-head trials
Main risks	Common: stomach upset, rash, headache. Rare but serious: liver problems. Taste or smell changes. Medicine interactions	Heat or warmth during treatment; the main risks are cost and treating without a confirmed diagnosis
Checks beforehand	Nail sample, medicines review, liver blood tests	Diagnosis, suitability, medicines and health history
Timing	Weeks to months of tablets, then healthy nail must grow out	Sessions over a planned course, then healthy nail must grow out
Cost	NHS prescription charges may apply	Private fee; ask for the full cost of the course

What the evidence on laser actually shows

Reviews of laser for fungal nails keep reaching the same place: some promise, little certainty.

• A 2024 systematic review and meta-analysis in Cureus reported that laser looked comparable to terbinafine with fewer adverse effects, but its authors said larger randomised trials were needed.
• An older review (Joanna Briggs Institute, 2015) described the evidence for the 1064 nm Nd:YAG laser as weak.
• Other work has found terbinafine did better on clinical recovery than laser in small head-to-head comparisons.
• Studies use different lasers, settings and schedules, which makes one general success figure unreliable. Treat any single success percentage quoted by a clinic with caution, especially if no study is named.

So the honest summary is that laser has not been shown to be as reliable as tablets, and the BAD does not currently recommend it by itself. Some people still choose it, usually because tablets are unsuitable or they would rather avoid them.

What tablets involve

Terbinafine is the better-evidenced route, but it is a prescription medicine with real checks:

• Confirm first. Many nail changes are not fungal. The BAD says confirmation by laboratory testing should come before treatment. See our guide to fungal nail infection or nail damage.
• Liver. The UK patient leaflet for terbinafine says blood tests are needed before and during treatment to monitor liver function, and that yellowing of the skin or eyes, unusually dark urine or pale stools need urgent medical help. The NHS also says people with liver or kidney disease cannot take antifungal tablets.
• Other medicines. The leaflet lists several that interact, including some antidepressants, beta-blockers, antiarrhythmics and ciclosporin. Always tell your prescriber and pharmacist everything you take.
• Pregnancy and breastfeeding. The leaflet says not to take terbinafine while breastfeeding, and in pregnancy only if a doctor advises it.
• Taste and smell. The leaflet says taste changes usually pass within weeks of stopping, but a very small number of people have longer-lasting changes. Loss of smell, which may be permanent, is listed as frequency not known.
• Common effects. Stomach upset, rash and headache are among those listed.

Who each option may suit

These are discussion points, not rules. A prescriber or practitioner will confirm what applies to you.

• Tablets are usually the first conversation when the infection is confirmed, has not cleared with pharmacy treatment, or affects several nails. The NHS says a GP can prescribe tablets if pharmacy treatments have not worked.
• Laser may be worth discussing if tablets are unsuitable, for example because of liver disease or medicines that interact, or you have decided against them. Be ready for the answer that the evidence is limited and that results are not guaranteed.
• Neither should start before the diagnosis is clear. A nail that is changing colour in a dark streak, bleeding, painful or red around the edges should be examined by a doctor first.
• Diabetes, poor circulation, reduced foot sensation or a weakened immune system: speak to your GP or podiatrist before any treatment. See our article on diabetes and a changed toenail.

Questions to ask before paying for laser

1. Has the infection been confirmed with a nail sample, or is the diagnosis a guess?
2. What does the clinic say the evidence is for the device it uses, and can it name the studies?
3. How many sessions are planned, and what is the total cost, including any repeats?
4. Will I still be advised to use a topical treatment or keep up foot care, and why?
5. How will success be judged? Healthy nail growing out from the base is the real sign, and it takes months.
6. What happens if the nail does not improve?

At Progen Aesthetics in Bournemouth, laser fungal nail treatment is offered, and the treatment page says plainly that the evidence for laser is more limited than for antifungal medicines and that results vary. The consultation is the place to talk through suitability, what laser can and cannot promise, and the cost. Our prices page shows current fees.

What stays the same either way

Whichever route you take, the infection is only cleared when healthy nail grows back from the base, and that takes months. Keep feet clean and dry, avoid sharing nail tools, and change socks and shoes that may harbour fungus. Do not stop or change prescribed medicines on the basis of this article.

Frequently asked questions

Is laser as good as terbinafine tablets for fungal toenails?

Not shown to be. The 2026 BAD guideline recommends terbinafine as a first-line option for adults without liver disease and makes no recommendation for laser on its own because the evidence is insufficient. Some reviews report promising results for laser, but their authors call for larger trials.

Do I need a test before starting terbinafine or laser?

The BAD guideline says laboratory confirmation should be obtained before treatment starts, because many nail changes are not fungal. Your GP or podiatrist can arrange a nail sample.

Do terbinafine tablets need blood tests?

The UK patient leaflet says liver function blood tests are needed before and during treatment. Your prescriber will advise what applies to you.

Is fungal nail laser available on the NHS?

The NHS fungal nail page describes pharmacy treatments, GP-prescribed tablets and, in severe cases, nail removal. It does not mention laser. Laser is generally a private option.

How long until a treated nail looks normal?

The NHS says the infection is cured when healthy nail grows back from the base, and improvement can take several months. Neither laser nor tablets give instant results.

Read about laser fungal nail treatment in Bournemouth

Sources and further information

• BAD 2026 guideline: terbinafine first-line for adults without liver disease (250 mg/day 12-16 weeks toenails); recommended for people with diabetes with dermatophyte infection and for immunosuppressed people; insufficient evidence to recommend laser monotherapies; laboratory confirmation before treatment; consider topical combined with physical therapy. Published as advance article 22 October 2026.
• GP can prescribe antifungal tablets if pharmacy treatments have not worked; people with liver or kidney disease cannot take them; blood tests before and during treatment; cured when healthy nail grows back from base; page does not mention laser.
• UK patient leaflet for one terbinafine tablet product: liver blood tests before and during treatment; do not take with severe liver or kidney problem or while breastfeeding; pregnancy only if doctor advises; interactions list; taste disturbance usually resolves within weeks, rarely longer; loss of smell may be permanent; common effects.
• 2024 systematic review and meta-analysis (Cureus) found laser promising, comparable efficacy to terbinafine with fewer adverse effects, and called for large randomised trials.
• 2015 Joanna Briggs Institute systematic review of laser for onychomycosis in community adults described the evidence for Nd:YAG as weak.