Terbinafine 250mg Tablets — Oral Antifungal Treatment for Fungal Nail Infections with Integrated Liver Function Monitoring
This is a licensed medicine — Terbinafine 250mg tablets are a licensed oral antifungal for the treatment of fungal nail infections (onychomycosis) caused by dermatophyte fungi. So each tablet contains 250mg terbinafine, which reaches high concentrations in nails to eliminate fungal infection at its source.
Standard dosing is 1 tablet once daily for 6 weeks (fingernails) or 12 weeks (toenails), though severe cases may need extended treatment. However, terbinafine carries a small but real risk of hepatotoxicity, including very rare cases of serious liver failure.
As a result, Courier Pharmacy supplies terbinafine only within a comprehensive liver function monitoring pathway — a genuine safety framework rather than defensive medicine. Furthermore, this pathway involves pre-treatment liver function testing before any tablets are supplied, plus mid-treatment testing at three weeks to catch any liver changes early. So this is specialist responsible antifungal prescribing rather than convenience-driven supply. Available at Courier Pharmacy after clinical review and LFT gateway completion.
At Courier Pharmacy, we believe in treatment that fits the person, but only where it’s honest, safe, and consented to.
This page covers what terbinafine 250mg tablets are, why the integrated liver function monitoring pathway matters clinically, how the two-test model works (or one test if you have a recent previous LFT), who terbinafine may suit, how it compares to alternative approaches, and the practical points that matter. Above all, we cover why the LFT gateway isn’t optional — it’s the framework that makes terbinafine supply genuinely safe.
The LFT gateway — please read first
Before going further, we want to be straight with you about how terbinafine supply works at Courier Pharmacy:
First of all, terbinafine can cause liver injury. In fact, this is documented in the licensed Summary of Product Characteristics with very rare cases of serious liver failure including fatal outcomes and cases requiring liver transplantation. Furthermore, the manufacturer specifically recommends liver function testing before prescribing and periodic monitoring during treatment. So responsible terbinafine supply requires proper liver function assessment — not optional add-ons but essential clinical safety.
Second, our supply pathway integrates liver function testing at two points:
- Pre-treatment LFT (test 1) — establishes baseline liver function before any terbinafine is supplied
- Mid-treatment LFT (test 2) — performed at three weeks of treatment to detect any liver changes early, before they become severe
Third, we accept a previous LFT if you have one:
- If you have had a full liver function panel within the last three months showing normal results, you may only need one home LFT test — the mid-treatment test at three weeks
- The previous LFT must include the full panel (ALT, AST, ALP, GGT, bilirubin, albumin, globulin)
- You’ll need to upload or share the results as part of your consultation
- Our prescriber verifies acceptability of your previous result
Fourth, terbinafine is only released once liver function is confirmed normal. So the sequence is:
- Consultation completed and prescriber approval obtained
- Pre-treatment LFT completed and result received (or previous acceptable LFT verified)
- Only if liver function is normal, one month of terbinafine tablets is supplied along with the second home LFT test
- Second LFT test must be performed after three weeks of treatment
- Only if the second LFT is also normal does treatment continue
- Any abnormal LFT triggers immediate treatment review and typically discontinuation
Above all, this framework isn’t paperwork. In fact, it’s the difference between safe and unsafe terbinafine supply. So if the LFT pathway feels inconvenient, please understand that patients have died from unrecognised terbinafine hepatotoxicity, and the monitoring genuinely prevents this outcome. Furthermore, the home blood test kits make the process much more practical than repeated GP visits.
If any of these points raise concerns, please talk to our prescriber before proceeding. After all, understanding the safety framework matters for informed choice.
Five key takeaways
- Terbinafine 250mg tablets are a licensed oral antifungal for fungal nail infections (onychomycosis), reaching high concentrations in nails to eliminate dermatophyte fungi at source. Standard dosing is 1 tablet daily for 6 weeks (fingernails) or 12 weeks (toenails)
- Terbinafine carries a small but real hepatotoxicity risk, including very rare cases of serious liver failure. So Courier Pharmacy supplies terbinafine only within an integrated liver function monitoring pathway with home blood test kits before and during treatment
- The full home LFT panel tests seven markers of liver function — ALT, AST, ALP, GGT, bilirubin, albumin, and globulin. Furthermore, this comprehensive assessment catches liver derangement earlier than basic ALT-only testing
- Two home LFT tests are standard — one before treatment starts, one at three weeks of treatment. However, if you have a previous full LFT within three months showing normal results, only the three-week mid-treatment test is required
- Treatment is genuinely effective for onychomycosis — 70-80% mycological cure rates and 60-70% clinical cure rates. However, results take months to show as nails grow out. Not for hepatic disease, terbinafine allergy, or pregnancy. Prescriber assessment before supply is essential
Why choose Courier Pharmacy for terbinafine supply
At Courier Pharmacy, our approach starts with a simple idea: treatment should fit the person, not force the person to fit the system.
Dr Ada Jex-Cori
Our service is shaped by the philosophy of Dr Ada Jex-Cori, our brand pharmacist.
Dr Ada represents the spirit of the pharmacy: evidence-led, community-rooted, and willing to challenge the one-size-fits-all approach to medicine. She is named in honour of three pioneering women in science: Ada Lovelace, the mathematician and visionary; Sophia Jex-Blake, the first female doctor in the UK who fought the medical establishment; and Gerty Cori, the biochemist and Nobel Prize winner.
In our fictional world of Etherwell, Dr Ada fights against pharma’s standardised approach to medicine. In the real world, she represents what we stand for. Her view is straightforward: you are not broken. The system is. And we are here to change that.
Terbinafine supply deserves proper safety framework
Terbinafine can cause serious harm without proper monitoring. Courier Pharmacy is different. So we recognise that:
- Terbinafine hepatotoxicity is real and can be fatal
- Pre-treatment LFT is genuinely important, not optional
- Mid-treatment monitoring catches problems early
- Home blood tests make the process practical rather than burdensome
- Comprehensive liver panel catches derangement earlier than basic testing
- Some pharmacies supply terbinafine without adequate monitoring — this isn’t safe
- The safety framework is what makes terbinafine supply responsible
Honest framing about terbinafine risk
The risk picture:
- Serious hepatotoxicity is very rare but genuine
- Fatal cases and cases requiring liver transplantation have occurred
- Most patients tolerate terbinafine without significant liver effects
- Risk is unpredictable and can occur without pre-existing liver disease
- Early monitoring can detect derangement before it becomes severe
- The LFT framework is designed to catch this early
- The framework reduces risk substantially compared to unmonitored supply
Honest framing about treatment expectations
What to genuinely expect:
- Cure rates 70-80% mycological, 60-70% clinical
- Improvement takes months to appear as nail grows out
- Complete visible clearance takes 9-12 months for toenails
- Some patients don’t respond adequately
- Reinfection is common without addressing risk factors
- Realistic expectations improve satisfaction with treatment
Honest framing about the LFT pathway
Why we do it this way:
- Some pharmacies supply terbinafine after basic online consultation only
- This isn’t consistent with the medicine’s safety profile
- Proper monitoring aligns with the licensed SmPC recommendations
- Home LFT kits make monitoring genuinely convenient
- The comprehensive seven-marker panel is more thorough than many pharmacies use
- Testing at three weeks catches problems earlier than the SmPC minimum (4-6 weeks)
- This is specialist responsible antifungal prescribing
Fungal nail infection and the bigger picture
Onychomycosis rarely sits in isolation. So our prescriber can discuss:
- Comprehensive foot health assessment
- Concurrent skin fungal infections (tinea pedis)
- Trigger factors and prevention
- Diabetes screening and control if relevant
- Peripheral vascular disease considerations
- Immunosuppression considerations
- Communal exposure sources (gyms, swimming pools, changing rooms)
- Footwear and hosiery advice
- Long-term prevention approach
- When to consider podiatry input
- Alternative approaches for treatment failures
Sometimes onychomycosis is part of a wider health picture worth discussing.
Prescriber support throughout treatment
Our team is here to discuss:
- Whether terbinafine fits your specific situation
- Whether the diagnosis needs confirmation via mycology first
- Whether topical treatment would suit better
- Whether alternative oral antifungals would fit better
- LFT interpretation and next steps
- Any symptoms during treatment
- Practical questions about the monitoring pathway
- What to do if you experience side effects
- When to seek urgent help
- Long-term prevention after treatment
Trust earned, not claimed
We are GPhC-regulated, and our content is grounded in the licensed Terbinafine Summary of Product Characteristics (various manufacturers), MHRA guidance on terbinafine safety, NICE clinical knowledge summaries on fungal skin infections and onychomycosis, British Association of Dermatologists guidelines on onychomycosis, and the real experience of managing patients through the terbinafine treatment pathway with appropriate monitoring.
If terbinafine 250mg isn’t the right answer for your situation, we’ll tell you honestly. After all, getting the right approach matters more than fulfilling a request.
How do I order terbinafine from Courier Pharmacy?
Complete the fungal nail infection consultation on courierstaging.mystagingwebsite.com. Our prescriber will review your history, presentation, previous treatments, and current situation, then guide you through the integrated LFT pathway. So the sequence is: consultation approval, LFT gateway completion, first month’s supply with second LFT kit, three-week LFT completion, continued supply based on results. Furthermore, your order goes out in plain, discreet packaging with prescriber support throughout treatment.
Active ingredient
Each Terbinafine 250mg tablet contains:
- Terbinafine 250mg (as terbinafine hydrochloride 281.25mg)
- Standard tablet excipients supporting stability and delivery
Why terbinafine specifically
Terbinafine offers specific advantages for fungal nail infections:
- Allylamine antifungal with fungicidal activity against dermatophytes
- Inhibits squalene epoxidase in fungal ergosterol synthesis
- Highly lipophilic — concentrates in nails, skin, and hair
- Reaches therapeutic concentrations in nail plate within weeks
- Persists in nails for months after treatment completion
- Well-established evidence base for onychomycosis
- Considered first-line oral antifungal for dermatophyte nail infections in UK guidelines
- Better cure rates than itraconazole for dermatophyte onychomycosis in most studies
So terbinafine represents the evidence-based standard for oral antifungal treatment of dermatophyte nail infections. In fact, decades of clinical experience support both its effectiveness and its safety profile when used with appropriate monitoring.
Why the 250mg strength once daily
The 250mg once daily dosing serves specific pharmacological requirements:
- Provides adequate plasma concentrations for nail penetration
- Standard adult dosing across all UK and international guidelines
- Once-daily convenience supports adherence
- Balances antifungal effect with tolerability
- Different from twice-daily antifungals like ketoconazole
- Same strength suits both fingernail and toenail treatment
- Duration differs (6 weeks fingernails, 12 weeks toenails) rather than dose
How terbinafine reaches the nail
Understanding this matters for treatment expectations:
- Terbinafine absorbed from gut into bloodstream
- Highly lipophilic — moves into fatty tissues including nail bed
- Concentrates in the nail matrix (growth zone) and diffuses into nail plate
- Reaches therapeutic concentrations in the nail within 2-3 weeks
- Kills fungus in the nail and nail bed
- Fungus can't reinfect the growing nail once therapeutic levels achieved
- Healthy new nail grows out from the matrix
- Old infected nail is gradually pushed out as new nail grows
- Terbinafine persists in the nail for 2-3 months after treatment stops
So the treatment works during the treatment course, but visible improvement takes months longer as the nail grows out. In fact, this is why the LFT monitoring at three weeks matters — we need to catch any liver problems early because effective antifungal action doesn't require you to complete the full course if liver function changes.
Other ingredients
The tablet contains standard tablet excipients supporting stability and delivery. Complete excipients list is provided with each supply. So mention any known allergies or sensitivities during your consultation.
Pack details
Terbinafine 250mg tablets come as:
- White to off-white round biconvex tablets
- Scored for possible division
- Blister packs preserve stability
- Courier Pharmacy supplies one month at a time (28 or 30 tablets)
- Sequential monthly supply linked to LFT monitoring milestones
- Various UK manufacturers supply generic terbinafine
The comprehensive home LFT blood test
The home blood test kits we use test seven markers of liver function. So this is a comprehensive liver assessment rather than a basic single-marker check. Furthermore, this comprehensive panel catches liver derangement earlier and more specifically than simpler tests.
What the LFT panel tests
ALT (alanine aminotransferase)
- Enzyme found predominantly in liver cells
- Most specific marker of liver cell injury
- Elevation suggests hepatocellular damage
- First marker to rise in most drug-induced liver injury
- Terbinafine hepatotoxicity classically raises ALT first
AST (aspartate aminotransferase)
- Enzyme found in liver, heart, muscle, and other tissues
- Less specific than ALT but still important marker
- Elevation alongside ALT confirms liver injury pattern
- AST:ALT ratio helps identify specific liver problems
ALP (alkaline phosphatase)
- Enzyme from liver, bone, and other tissues
- Elevation suggests cholestatic (bile flow) problems
- Complements ALT/AST for full liver injury picture
- Some terbinafine hepatotoxicity presents with cholestatic pattern
GGT (gamma-glutamyl transferase)
- Enzyme from liver, bile ducts, and other tissues
- Sensitive marker of hepatobiliary problems
- Elevation confirms hepatic origin when ALP is raised
- Also affected by alcohol and some medications
Bilirubin
- Breakdown product of red blood cells processed by liver
- Elevation suggests significant liver dysfunction or bile flow problems
- Higher-risk indicator when raised in drug-induced liver injury
- Persistent bilirubin rise particularly concerning
Albumin
- Main protein produced by liver
- Reflects liver synthetic function
- Reduction suggests significant chronic or severe acute liver dysfunction
- Important marker of overall liver health
Globulin
- Includes immunoglobulins and other proteins
- Total protein minus albumin
- Chronic liver disease may show altered pattern
- Adds context to overall assessment
How the home LFT kit works
- Kit arrives in discreet packaging with clear instructions
- Small finger-prick blood sample collected using included lancet
- Blood collected into provided sample tube
- Sample sealed and returned via prepaid post
- Accredited laboratory processes sample
- Results typically available within 2-3 working days
- Results reviewed by our prescriber before treatment continues
- You'll receive both the technical results and prescriber interpretation
What is Terbinafine 250mg for?
Terbinafine 250mg tablets are licensed for the treatment of fungal skin and nail infections caused by dermatophyte fungi (particularly Trichophyton species, Microsporum canis, and Epidermophyton floccosum). So the main clinical scenario is onychomycosis — fungal infection of the nails — which typically requires several months of oral antifungal treatment because topical treatments can't reach the fungus adequately once it's established in the nail plate.
What onychomycosis actually is
Understanding the clinical picture:
- Fungal infection of the nail (fingernails or toenails)
- Toenails affected more often than fingernails (approximately 10:1)
- Caused by dermatophyte fungi in most cases (Trichophyton rubrum most common)
- Also occasionally caused by yeasts (Candida) or non-dermatophyte moulds
- Presents with thickened, discoloured, brittle nails
- May involve one or multiple nails
- Often progressive without treatment
- Can affect quality of life, footwear choices, self-confidence
- Can be entry point for bacterial cellulitis, particularly in diabetes
Who might Terbinafine 250mg suit?
This medicine may suit:
- Adults with dermatophyte fungal nail infection confirmed by mycology or strongly suspected clinically
- Adults with fingernail onychomycosis (6-week treatment courses)
- Adults with toenail onychomycosis (12-week or longer courses)
- Adults who have tried topical antifungals without adequate response
- Adults where nail involvement is significant or symptomatic
- Adults with fungal nail infection affecting quality of life
- Adults with diabetes where fungal nail infection increases cellulitis risk
- Adults with normal liver function or well-controlled liver conditions
- Adults engaged with the pre-treatment and mid-treatment LFT pathway
- Adults committed to daily use for full treatment duration
What Terbinafine 250mg may help with
Based on antifungal pharmacology and clinical evidence:
- Elimination of dermatophyte fungi from infected nails
- Clearance of fungal infection over months as new healthy nail grows out
- Improvement in nail appearance as healthy nail replaces infected nail
- Resolution of associated skin fungal infections
- Prevention of spread to other nails
- Reduction in secondary complications including bacterial cellulitis
- Improvement in confidence around affected nails
However, an important honesty point: terbinafine doesn't produce immediately visible improvement. In fact, the fungus is killed relatively quickly during treatment, but the infected nail still needs to grow out and be replaced by healthy nail. Furthermore, toenails grow slowly — approximately 1-1.5mm per month — so complete visible clearance takes 9-12 months after treatment starts. So don't expect dramatic improvement during the treatment course itself. Additionally, treatment success rates are genuine but not universal — approximately 70-80% mycological cure (fungus eliminated) and 60-70% complete clinical cure (nail returns to normal appearance).
What Terbinafine 250mg doesn't claim to do
Honest framing matters:
- It doesn't produce immediately visible improvement — nail growth takes months
- It doesn't work for all fungal infections — yeast infections (Candida) respond less well
- It doesn't cure every patient — some have recurrent or persistent infection
- It doesn't repair damaged nail structure — only enables healthy regrowth
- It doesn't work if underlying causes persist — diabetic patients need diabetes control
- It doesn't prevent reinfection — reinfection is common without addressing sources
- It doesn't work without the LFT monitoring framework — supply requires the safety pathway
- It doesn't replace addressing risk factors (poor foot hygiene, occlusive footwear, communal changing areas)
- It doesn't work for non-fungal nail dystrophy (psoriasis, trauma, other causes)
How Terbinafine 250mg works
Understanding the antifungal mechanism helps explain both what to expect and why the treatment duration matters.
The antifungal mechanism
Terbinafine targets fungal cell membrane synthesis:
- Terbinafine inhibits squalene epoxidase in fungi
- This enzyme is essential for ergosterol synthesis
- Ergosterol is a critical component of fungal cell membranes
- Without ergosterol, fungal cell membranes become defective
- Squalene accumulates in fungal cells, causing further toxicity
- Fungal cells die (fungicidal action)
- Human cells use different sterol pathway, so aren't affected the same way
- Selective toxicity is why terbinafine works against fungi with limited effect on host cells
So terbinafine works by disrupting fungal cell membrane formation. In fact, this fungicidal action (killing fungus) is stronger than the fungistatic action (stopping fungal growth) of some alternative antifungals.
Why the treatment duration matters
Duration reflects nail biology:
- Terbinafine kills fungus in nail over the first few weeks
- However, existing infected nail remains until it grows out
- Fingernails grow approximately 3mm per month
- Toenails grow approximately 1-1.5mm per month
- Full nail replacement takes 6 months for fingernails, 12-18 months for toenails
- Treatment duration ensures adequate nail penetration and fungicidal effect
- Terbinafine persists in nail for 2-3 months after treatment stops
- This sustained level continues antifungal effect during nail regrowth
Onset timeline
What to expect:
- First 2-3 weeks: terbinafine reaches therapeutic nail concentrations
- Weeks 3-6: fungus being eliminated but visible change limited
- Weeks 6-12: visible improvement at nail base as new healthy nail grows
- Months 3-6: continued visible improvement as infected nail grows out
- Months 9-12: complete visible clearance in successful cases (toenails)
- Beyond 12 months: reinfection assessment and prevention considerations
Warnings and precautions
Terbinafine has specific safety considerations that make the LFT monitoring pathway genuinely important.
Don't take Terbinafine 250mg if you
- Have chronic or active hepatic disease
- Have hypersensitivity to terbinafine or any excipient
- Have abnormal baseline liver function tests
- Are pregnant or planning pregnancy
- Are breastfeeding
- Have severe renal impairment (dose adjustment or alternative may be needed)
- Have active alcohol dependency without proper assessment
The hepatotoxicity consideration
Critical safety point:
- Terbinafine can cause liver injury
- Very rare cases of serious liver failure documented in the SmPC
- Some cases have been fatal or required liver transplantation
- Liver injury can occur in patients without pre-existing liver disease
- Onset typically within first 4-6 weeks of treatment
- Pre-treatment LFT establishes baseline
- Three-week monitoring catches early derangement
- Symptoms of hepatotoxicity include persistent nausea, decreased appetite, fatigue, vomiting, right upper abdominal pain, yellowing of skin or eyes, dark urine, pale stools
- Any of these symptoms warrants immediate cessation and urgent medical assessment
The taste disturbance consideration
A specific side effect worth knowing about:
- Terbinafine can cause taste disturbance including complete loss of taste
- Occurs in approximately 1 in 100 patients
- Onset typically within first few weeks
- Usually reversible after stopping treatment
- Recovery can take weeks to months
- Rarely, taste disturbance can be prolonged or permanent
- Discuss with prescriber if occurs — treatment usually continued if not distressing
The blood disorder consideration
Rare but important:
- Terbinafine has been associated with blood disorders including neutropenia
- Symptoms include fever, sore throat, unusual bruising or bleeding, fatigue
- Not routinely monitored but warrants urgent assessment if symptoms occur
The skin reaction consideration
Rare but potentially serious:
- Severe skin reactions have been reported very rarely (Stevens-Johnson syndrome, toxic epidermal necrolysis)
- Any new severe or widespread rash needs urgent assessment
- Discontinue treatment immediately if severe skin reaction develops
Use with care if you
- Have mild to moderate renal impairment
- Have autoimmune conditions including lupus
- Are on medications with terbinafine interactions
- Have history of skin sensitivity or drug reactions
- Have significant alcohol consumption
Pregnancy and breastfeeding
- Not for use during pregnancy — safety data limited
- Not for use during breastfeeding — passes into breast milk
- Effective contraception during use in women of childbearing age
- Fungal nail infections generally aren't urgent enough to warrant pregnancy risk
- Treatment can be deferred until after pregnancy and breastfeeding complete
Driving and machinery
Generally doesn't affect driving:
- Terbinafine usually doesn't affect driving
- However, some patients report dizziness or malaise
- Don't drive if experiencing these symptoms
When to seek urgent medical help
- Yellowing of skin or eyes (jaundice)
- Dark urine or pale stools
- Persistent nausea, vomiting, or loss of appetite
- Severe fatigue
- Right upper abdominal pain
- Fever with sore throat, mouth ulcers, or unusual bruising
- Severe or widespread rash
- Any signs of severe allergic reaction
- Any concerning symptom during treatment
Side effects
Terbinafine has a specific side effect profile. Most are mild but some are important.
Very common side effects (may affect more than 1 in 10 people)
- Feeling of fullness
- Decreased appetite
- Mild abdominal pain
- Indigestion, nausea
- Mild diarrhoea
- Rash, urticaria
- Muscle or joint pain
- Headache
Common side effects (may affect up to 1 in 10 people)
- Loss of taste or taste disturbance
- Dizziness
- Feeling generally unwell
- Fatigue
Uncommon side effects (may affect up to 1 in 100 people)
Rare side effects (may affect up to 1 in 1,000 people)
- Reduced hearing or ringing in ears
- Liver problems including hepatitis
- Increased liver enzymes on blood tests
- Jaundice
- Blood disorders
- Serious skin reactions
Very rare side effects (may affect up to 1 in 10,000 people)
- Serious liver failure (some cases fatal or requiring transplant)
- Stevens-Johnson syndrome
- Toxic epidermal necrolysis
- Serum sickness-like reactions
- Pancreatitis
- Loss of smell
- Persistent taste disturbance
Stop and seek urgent medical help if
- Signs of severe allergic reaction (facial swelling, breathing difficulty)
- Signs of liver problems (jaundice, dark urine, pale stools, right upper abdominal pain)
- Severe or widespread skin rash
- Signs of blood disorder (unexplained bruising, bleeding, fever)
- Severe abdominal pain
Yellow Card reporting
If you experience any side effects, you can report them via the MHRA Yellow Card Scheme at https://yellowcard.mhra.gov.uk/. Reporting side effects helps improve safety information for all patients.
Drug interactions
Terbinafine has several interactions worth knowing about. Furthermore, it's metabolised by cytochrome P450 enzymes, affecting some other medications.
Interactions requiring care
- Rifampicin — reduces terbinafine plasma concentrations by approximately 50%
- Cimetidine — increases terbinafine plasma concentrations by approximately 30%
- Tricyclic antidepressants (amitriptyline, nortriptyline, imipramine) — terbinafine may increase levels
- SSRIs — terbinafine may increase levels of some SSRIs
- Beta-blockers metabolised by CYP2D6 (metoprolol, propranolol) — terbinafine may increase levels
- Antiarrhythmics (flecainide, propafenone) — terbinafine may increase levels
- MAO inhibitors — terbinafine may affect levels
- Warfarin — some reports of altered INR, monitoring recommended
- Ciclosporin — may need level monitoring
- Contraceptives — reports of irregular bleeding, generally not affecting contraceptive efficacy
Not usually clinically significant
- Most other medications — no significant interaction
- Most antihypertensives (except those noted above)
- Most antibiotics — generally safe
- Standard contraceptives — generally safe
Combinations requiring particular care
- Other hepatotoxic medications (methotrexate, isoniazid, statins at high doses)
- Multiple medications metabolised by CYP2D6
Alcohol
Important during treatment:
- Alcohol can add to liver stress during terbinafine treatment
- Moderate alcohol use may be acceptable but discuss with prescriber
- Excessive alcohol during treatment particularly increases hepatotoxicity risk
- Consider avoiding alcohol during treatment course
- Complete avoidance recommended if any liver concerns
Frequently asked questions
Why do I need blood tests for a nail infection medicine?
Terbinafine can cause liver problems:
- Terbinafine has a small but real risk of liver injury
- Very rare cases have been fatal or required liver transplant
- The SmPC specifically recommends LFT before prescribing and during treatment
- Home blood tests catch problems early before they become severe
- This is responsible specialist prescribing, not extra paperwork
Can I skip the pre-treatment blood test?
Only if you have an acceptable previous LFT:
- Previous LFT must be within the last three months
- Must include the full seven-marker panel (ALT, AST, ALP, GGT, bilirubin, albumin, globulin)
- Results must be normal
- Prescriber verifies acceptability
- Otherwise, pre-treatment home LFT is required
How does the home blood test work?
Straightforward finger-prick process:
- Kit arrives in discreet packaging
- Clear instructions included
- Small finger-prick sample using included lancet
- Sample sealed and returned via prepaid post
- Results within 2-3 working days
When do I take the second blood test?
At three weeks of treatment:
- Perform after three weeks of daily terbinafine
- Second LFT kit sent with your first month's supply
- Complete before completing the first month
- Return sample promptly for timely results
What happens if my LFT is abnormal?
Defined response pathway:
- Pre-treatment abnormal: terbinafine not supplied, prescriber discusses alternatives
- Mid-treatment abnormal: treatment paused, prescriber review, typically discontinuation
- Significant elevation: immediate stop and possible GP or specialist referral
- Mild transient elevation: prescriber assessment, possible repeat testing
How long does treatment take?
Depends on nails affected:
- Fingernails: 6 weeks of tablet treatment typically
- Toenails: 12 weeks of tablet treatment typically
- Severe cases: may extend to 16-24 weeks
- Visible improvement continues for months after treatment ends
- Complete visible clearance takes 9-12 months for toenails
When will I see improvement?
Slowly:
- First weeks: minimal visible change
- Weeks 6-12: healthy new nail appearing at base
- Months 3-6: continued visible improvement
- Months 9-12: complete visible clearance in successful cases
- Patience matters — the fungus is killed during treatment but nail growth takes time
Does terbinafine really work?
Yes for most patients:
- 70-80% achieve mycological cure (fungus eliminated)
- 60-70% achieve complete clinical cure (nail returns to normal)
- Better response rates than topical treatments
- Better response rates than itraconazole for dermatophyte infections
- Not all patients respond — some need alternative approaches
Can I drink alcohol during treatment?
Preferably minimise:
- Alcohol adds to liver stress during terbinafine treatment
- Excessive alcohol particularly increases hepatotoxicity risk
- Moderate use may be acceptable but discuss with prescriber
- Complete avoidance recommended if any liver concerns
What if I get taste changes?
Common side effect:
- Approximately 1 in 100 patients experience taste disturbance
- Usually reversible after stopping treatment
- Recovery can take weeks to months
- Discuss with prescriber
- Treatment usually continued if not distressing
- Rarely, taste disturbance can be prolonged
What if I forget a dose?
Standard approach:
- Take when remembered unless close to next dose
- Don't double dose
- Occasional missed doses won't significantly affect treatment
- Consistent adherence improves cure rates
Can I use during pregnancy?
No:
- Not for use during pregnancy — safety data limited
- Effective contraception during use
- Fungal nail treatment can wait until after pregnancy and breastfeeding
Can I use while breastfeeding?
No:
- Terbinafine passes into breast milk
- Not recommended during breastfeeding
- Treatment can be deferred
Can children take terbinafine?
Specialist decision:
- Not routinely used in children under 18
- Specialist paediatric or dermatology input if considered
- Different dosing considerations
- Careful monitoring required
Will my nail definitely return to normal?
Usually but not always:
- 60-70% achieve complete clinical cure
- Some patients see improvement without complete resolution
- Long-standing damage may not fully reverse
- Reinfection risk affects long-term outcomes
- Addressing risk factors improves long-term results
How can I prevent reinfection?
Multiple strategies:
- Good foot hygiene
- Change socks daily and wear breathable materials
- Rotate footwear to allow drying
- Wear flip-flops in communal changing areas
- Treat concurrent skin fungal infections
- Address any diabetes control
- Consider prophylactic topical antifungal in high-risk patients
How should I store terbinafine?
- Below 25°C
- In original blister pack
- Protect from light
- Away from moisture
- Keep out of reach of children
- Use by expiry date
Is my packaging discreet?
- Plain packaging with no mention of contents
- Suitable for delivery to home or workplace
- Both tablets and LFT kits arrive discreetly
How much does the LFT pathway cost?
Included in supply pricing:
- The LFT pathway is integrated into the terbinafine supply cost
- Not charged separately
- Represents responsible specialist prescribing
- Contact customer service for specific pricing details
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This page is for information only and isn't a substitute for personal medical advice. Terbinafine 250mg is a prescription-only medicine (POM) for the treatment of fungal nail and skin infections caused by dermatophytes. Supply requires completion of the integrated liver function monitoring pathway including pre-treatment LFT (or acceptable previous LFT within three months) and mid-treatment LFT at three weeks. Contraindicated in chronic or active hepatic disease, hypersensitivity to terbinafine, pregnancy, and breastfeeding. Terbinafine can cause serious liver injury including very rare cases of fatal liver failure or requirement for liver transplantation. Any signs of hepatotoxicity (persistent nausea, decreased appetite, fatigue, vomiting, right upper abdominal pain, jaundice, dark urine, pale stools) require immediate cessation and urgent medical assessment. Signs of severe allergic reaction, severe skin reaction (Stevens-Johnson syndrome, toxic epidermal necrolysis), or blood disorders require immediate medical attention (999). Regular monitoring throughout treatment is essential. Any abnormal LFT triggers immediate treatment review and typically discontinuation. This medicine must be used within the specified monitoring framework — supply without appropriate monitoring is not consistent with the medicine's safety profile.
How this content was created
Written by the Courier Pharmacy editorial team and reviewed by a GPhC-registered prescribing pharmacist.
The content is grounded in the licensed Terbinafine Summary of Product Characteristics from multiple UK manufacturers, MHRA guidance on terbinafine safety and hepatotoxicity monitoring, NICE Clinical Knowledge Summaries on fungal skin infections and onychomycosis, British Association of Dermatologists guidelines on onychomycosis management, evidence from major clinical trials on terbinafine efficacy and safety, and the real experience of patients managed through the integrated LFT monitoring pathway at Courier Pharmacy.
References
- Electronic Medicines Compendium (emc) Terbinafine 250mg Tablet Summary of Product Characteristics. https://www.medicines.org.uk/emc/product/7133/smpc
- NICE Clinical Knowledge Summary — Fungal nail infection. https://cks.nice.org.uk/topics/fungal-nail-infection/
- British National Formulary — Terbinafine. https://bnf.nice.org.uk/drugs/terbinafine/
