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Aciclovir treats infections caused by herpes viruses, including chickenpox and shingles. Tablets and liquid need a prescription.
What should I know about Aciclovir?
Start promptly after it has been prescribed, following the instructions for your specific infection. Most infections start to improve after a few days of treatment.
What are the side effects?
Tablets and liquid can cause headaches, dizziness, nausea and vomiting. Do not drive if you feel dizzy.
Who should check first?
Tell your doctor about your medical conditions and medicines, and if you are pregnant or breastfeeding.
When should I get help?
See your doctor if the infection is not improving or you feel very unwell. Call your local emergency number (000 in Australia) for swelling of the throat or tongue, or trouble breathing.
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 aciclovir. 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.