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Valaciclovir

Also sold as: Valtrex

Prescription neededAntivirals

Comes as:Tablet

Usual adult dose

Also sold as: Valtrex

Prescription neededAntivirals

Comes as:Tablet

Cold sores: 2 g twice a day for 1 day. Genital herpes: 500 mg twice a day for 3 to 5 days. Shingles: 1 g three times a day for 7 days.

Your doctor may give you a different dose. Children's doses depend on weight.

Stop taking it and see a doctor straight away if you notice:

No important interactions are listed in our database. Still tell your doctor or pharmacist everything you take.

Category B

No risk seen in animal studies, but there are few studies in pregnant women. Usually considered safe when needed.

Similar medicines your doctor or pharmacist may offer instead.

Always follow your doctor or pharmacistThis page is general information, not a prescription. Do not start, stop or change a medicine on your own.