Griseofulvin
In brief
- Griseofulvin is a prescription-only medicine (POM) in the UK. Please note that use should still be medically supervised because dosing and monitoring matter, especially with liver disease and pregnancy.
- Griseofulvin is used to treat dermatophyte fungal infections such as tinea capitis, tinea corporis, tinea pedis and tinea unguium (onychomycosis). It works by inhibiting fungal cell mitosis through binding to fungal microtubules, stopping the fungus from growing.
- The usual dose for adults is 500–1000 mg daily in single or divided doses. For children, it is commonly 10–20 mg/kg/day, and in some cases 10–25 mg/kg/day depending on age and formulation, with the dose not exceeding the adult maximum.
- It is taken by mouth as tablets or oral suspension. Common strengths include 125 mg and 500 mg tablets and a 125 mg/5 mL suspension.
- Griseofulvin does not work immediately; improvement is usually seen after several days to a few weeks, depending on the infection and site, with scalp and skin infections often responding faster than nail infections.
- The duration of action is prolonged because it accumulates in keratin, so treatment usually lasts 2–6 weeks for tinea capitis or corporis, 4–6 months for fingernail infections, and 6–12 months for toenail infections. Therapy is often continued for at least 2 weeks after symptoms improve.
- Alcohol should be avoided, as griseofulvin may cause a disulfiram-like reaction in some people and can also increase the risk of adverse effects.
- The most common side effects are headache, dizziness, nausea, vomiting, diarrhoea, photosensitivity, rash and tiredness. Less commonly, it may cause insomnia, urticaria, or changes in blood counts or urine tests.
- Would you like to try griseofulvin without a prescription?
Legal status and availability in the UK
Griseofulvin is a prescription-only medicine (POM) in the UK.
In our online pharmacy, griseofulvin is available without a prescription, with discreet delivery to the United Kingdom in 9–21 days.
Basic griseofulvin information
- INN (international nonproprietary name): Griseofulvin
- Brand names available in the United Kingdom: Griseofulvin (generic packs)
- ATC code: D01BA01
- Forms & dosages: Tablets 125 mg, 500 mg; oral suspension 125 mg/5 mL
- Registration status in the United Kingdom: prescription only
- OTC / Rx classification: prescription only (Rx)
Clinical effectiveness in the United Kingdom practice
Wondering whether griseofulvin 500mg actually clears a fungal infection, or just keeps it under control?
In NHS-style use, griseofulvin is effective against dermatophytes, but it does not treat yeasts or bacterial infections.
That means it is a treatment for ringworm-type infections, not a broad “skin infection” medicine.
Clinical success depends on taking the right dose, staying on treatment long enough, and continuing after symptoms start to fade.
Adults are commonly treated with 500–1000mg daily, while children often need 10–20mg/kg/day and may do better with a liquid formulation.
Benefits usually include less scalp scaling, reduced itch, and gradually better nail appearance, although nail improvement can take months and that frustrates many patients.
In practice, response also depends on diagnosis accuracy, because prolonged treatment is only sensible when fungal confirmation has been considered.
- Clinical cure
- The infection is no longer visible on examination.
- Mycological cure
- Fungal testing no longer shows the organism.
- Symptom improvement
- Itch, scaling, or discomfort has eased, even if the full course is not finished yet.
Older does not mean ineffective here, especially when a child-friendly suspension matters.
Indications and MHRA-approved uses
Which fungal problems is griseofulvin actually meant to treat?
It is used for dermatophyte infections of the skin, hair and nails, and the licensed uses are straightforward.
- Tinea capitis — scalp ringworm, especially relevant in children.
- Tinea corporis — ringworm on the body.
- Tinea pedis — athlete’s foot.
- Tinea unguium — fungal nail infection, also called onychomycosis.
It is not used for Candida, yeast infections or bacterial infections.
In the UK, it is a prescription-only medicine regulated by the MHRA.
Off-label use is uncommon and usually needs specialist input, because UK clinicians generally prefer established dermatology pathways for unusual or resistant cases.
In children, the oral suspension is often the practical reason to choose it, and that can matter more than brand-name recognition.
Composition, brand landscape and United Kingdom packaging
What is inside the packet, and why do pharmacy packs look different from one supplier to the next?
The active ingredient is griseofulvin, and the INN is the same internationally.
UK patients often ask for a specific brand, but pharmacists usually dispense the generic prescription antifungal that is available at the time.
| Form | Strength | Typical packaging |
|---|---|---|
| Tablet | 125mg, 500mg | Bottles or blister packs |
| Suspension | 125mg/5mL | Bottles |
Injectable or topical systemic forms are not marketed for systemic infection control.
That matters in real life, because most people need a tablet or a liquid, not a cream.
Generic packs are common across pharmacies, and the exact look of griseofulvin tablets can vary by manufacturer.
Contraindications and special precautions
Is griseofulvin safe for everyone?
No medicine in this class is, and this one needs careful checking before it is started.
- Absolute contraindication
- The medicine should not be used if severe hepatic impairment, known hypersensitivity to griseofulvin or excipients, porphyria, or pregnancy is present.
- Relative contraindication
- Use is possible only with close monitoring if there is mild to moderate liver disease, lupus erythematosus, alcohol abuse, or a need to avoid pregnancy carefully.
- Monitoring required
- Liver function and drug interactions should be reviewed, because griseofulvin is metabolised hepatically.
Pregnancy avoidance is critical: women should use effective contraception during treatment and for 1 month afterwards, and men should not father a child during treatment and for 6 months afterwards.
Photosensitivity is common, so sun protection is sensible, especially in summer or on holiday.
People who feel dizzy should be careful with driving or operating machinery.
Older adults do not automatically need a dose change, but they do need the same practical pharmacy counselling on liver function and interactions.
If someone has multiple medicines or a long-term condition, a GP or pharmacist review is the safest next step.
Dosage guidelines
How much should be taken, and for how long does the treatment usually run?
That is the question most people ask first, especially when they see a long course on the label.
Adult dosing is commonly 500–1000mg daily for tinea capitis, tinea corporis, tinea unguium and tinea pedis.
Children usually take 10–25mg/kg/day depending on age and formulation, with suspension preferred for younger patients.
Long courses are normal, and stopping too early is a common reason treatment fails.
| Condition | Typical dose range | Usual duration |
|---|---|---|
| Tinea capitis | Adults 500–1000mg daily; children 10–25mg/kg/day | 2–6 weeks |
| Tinea corporis | Adults 500–1000mg daily; children 10–25mg/kg/day | 2–6 weeks |
| Fingernail onychomycosis | Adults 500–1000mg daily | 4–6 months |
| Toenail onychomycosis | Adults 500–1000mg daily | 6–12 months |
Treatment should continue at least 2 weeks after clinical resolution.
Liquid griseofulvin suspension may be preferred for children because dosing is easier to tailor.
Taking it with a fatty meal may be advised if that matches the product guidance, because absorption can improve.
Renal adjustment is not usually a major issue, but liver caution remains important.
Interaction overview: food, drink and medicines
Can a glass of wine or another medicine make problems worse?
With griseofulvin, alcohol is best avoided because of the risk of a disulfiram-like reaction.
Dizziness and nausea can be worse if alcohol is taken alongside it.
Other antifungal drug interactions and medicines affecting the liver also deserve caution, because the medicine is metabolised hepatically.
If a dose is missed, it should be taken as soon as remembered unless the next dose is nearly due.
Missed doses should not be doubled.
Overdose symptoms may include nausea, vomiting and dizziness, and supportive treatment is used if medical help is needed.
- Alcohol — avoid, because it can trigger unpleasant reactions.
- Other liver-affecting medicines — check with a pharmacist or GP before combining.
- Other antifungals — ask for advice before switching or overlapping treatment.
- Safety reporting — the UK Yellow Card system can be used for suspected adverse reactions.
There is no special tea or coffee restriction in the data, but consistent dosing with food is often the practical choice.
Comparable medicines and prescribing preferences
Which alternative works best if griseofulvin is not the right fit?
That depends on the site of infection, age, liver health, interactions and how long the patient can commit to treatment.
UK clinicians often prefer terbinafine for nail disease because the course is usually shorter and efficacy is strong.
Itraconazole and fluconazole are also used in selected cases, while ketoconazole has limited systemic use because of side effects.
Griseofulvin’s strengths are its established paediatric use and suspension option.
| Medicine | Strengths | Drawbacks | Typical UK use case |
|---|---|---|---|
| Griseofulvin | Good dermatophyte activity, child-friendly suspension | Longer courses, more counselling needed | Tinea capitis and paediatric use |
| Terbinafine | Shorter course, strong nail efficacy | Not always best for every patient | Onychomycosis treatment options |
| Itraconazole | Useful alternative in selected cases | Interaction considerations | Specialist-led dermatology treatment |
| Fluconazole | Alternative systemic antifungal | Not the usual first choice for dermatophytes | Selected fungal infections |
Shared decision-making makes sense here, because the best antifungal is the one the patient can safely take correctly.
Frequently asked questions for NHS patients
What is griseofulvin used for? It is used for dermatophyte infections such as tinea capitis, tinea corporis, tinea pedis and tinea unguium.
How long does griseofulvin take to work? Skin and scalp symptoms may improve over weeks, while nail infection treatment can take months.
Can I drink alcohol? It is best avoided because of the disulfiram-like reaction risk and worsening dizziness or nausea.
What if I miss a dose? Take it when remembered unless the next dose is nearly due, and do not double up.
If symptoms worsen, or if there is liver disease, pregnancy, severe rash or persistent vomiting, speak to a pharmacist, GP or NHS 111.
Guidelines for proper use and United Kingdom counselling
What does safe day-to-day use actually look like?
It starts with taking the medicine exactly as prescribed and not stopping early just because the skin looks better.
Long nail-fungus courses are normal, not a sign that the treatment is failing.
Storage matters too: keep griseofulvin at room temperature, away from moisture and sunlight, and do not freeze suspensions.
Shake liquid well before use, because the dose needs to be mixed evenly.
Keep the original packaging, because that helps stability and makes pharmacy checks easier.
| Storage point | Practical advice |
|---|---|
| Temperature | Store at 15–30°C |
| Light and moisture | Keep away from both |
| Suspension | Do not freeze and shake well before use |
| Packaging | Keep in the original container |
- Take with food if the product guidance or pharmacist advises it.
- Protect skin from sun exposure because photosensitivity can happen.
- Avoid alcohol during treatment.
- Report dizziness, rash, vomiting or other side effects promptly.
- Use NHS patient portals or pharmacy text reminders if a long course makes adherence difficult.
- If an overdose is suspected, seek medical help or poison advice straight away.
That practical routine is often what turns a frustrating fungal infection into a properly treated one.
Delivery across the United Kingdom
| City | Region | Delivery Time |
|---|---|---|
| London | Greater London | 9–21 days |
| Birmingham | West Midlands | 9–21 days |
| Manchester | North West England | 9–21 days |
| Glasgow | Scotland | 9–21 days |
| Edinburgh | Scotland | 9–21 days |
| Liverpool | North West England | 9–21 days |
| Leeds | West Yorkshire | 9–21 days |
| Sheffield | South Yorkshire | 9–21 days |
| Bristol | South West England | 9–21 days |
| Cardiff | Wales | 9–21 days |
| Newcastle upon Tyne | North East England | 9–21 days |
| Nottingham | East Midlands | 9–21 days |
| Leicester | East Midlands | 9–21 days |
| Aberdeen | Scotland | 9–21 days |
| Plymouth | South West England | 9–21 days |
