What it is used for
- Ringworm of the scalp (tinea capitis), especially in children
- Ringworm of the body, groin, and feet that has not cleared with creams
- Fungal nail infections (less commonly today)
How it works
Griseofulvin is taken up into newly forming skin, hair, and nails, where it interferes with the fungus's ability to grow and divide. As healthy tissue grows in, the fungus is gradually pushed out, which is why treatment can take weeks to months.
How it is taken
Comes as tablets and an oral liquid/suspension. It is usually taken with or after a meal, ideally one containing some fat, which helps the body absorb it. Take it exactly as your doctor, pharmacist, or label directs and complete the full course, which can be long, especially for scalp or nail infections.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Headache
- Nausea or stomach upset
- Diarrhoea
- Tiredness
- Skin rash
- Sensitivity to sunlight
Serious effects — get help
- Signs of liver problems (yellow skin or eyes, dark urine)
- Severe skin reactions with blistering or peeling
- Signs of a blood disorder (sore throat, fever, unusual bruising or bleeding)
- Severe allergic reaction
- Confusion or marked dizziness
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Combined hormonal contraceptives may work less well, so additional contraception is advised
- Warfarin and other blood thinners (effect may be reduced)
- Alcohol may cause flushing and a faster heartbeat
- Tell your clinician about all your medicines
Who should take care
- Use additional or alternative contraception during and for a period after treatment
- Avoid alcohol during treatment
- Protect skin from strong sunlight
- Avoided in pregnancy; effective contraception is important for both partners around treatment
- Tell your doctor about liver problems or porphyria