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Benzoyl peroxide is an antiseptic treatment for mild to moderate acne.
What should I know about Benzoyl Peroxide?
It can take about 4 weeks to start helping, but seek advice if acne worsens or has not improved after 12 weeks.
What are the side effects?
Skin irritation is the most common side effect. Use it less often at first if this happens. It can bleach hair and clothing.
Who should check first?
Avoid strong sunlight, and use an oil-free sunscreen. Ask a pharmacist before you start if you are unsure.
When should I get help?
See a doctor if your acne is severe or is not improving.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About benzoyl peroxide. General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.