> Western Medicines > Valaciclovir


Used for: Herpes zoster (Shingles), Herpes simplex virus infections
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What is Valaciclovir for?

Shingles is caused by infection of varicella zoster virus (VZV). Patients will feel strong pain on the blisters formed as a group over their bodies. Shingles often takes place in older people who had chickenpox before. It can cause blindness if there are shingles near the eyes. 


Valaciclovir blocks the virus from replication by inhibiting DNA polymerase of viruses. Therefore, it is used to treat herpes simplex virus infection and shingles.

How to use it?

There are capsules and tablets for oral use. It does not differ much whether you take it with food or not. If GI upset occurs, administer with meals.


Herpes zoster infection
Take 1g 3 times daily for 7 days.
Immunocompromised adult
Take 1g 3 times daily for 7 days or more, continue for 2 days after crusting of lesions.


Herpes simplex virus, first episode
Take 500mg twice daily for 5 days. Continue if healing incomplete or new lesions form.
Immunocompromised adult
Take 1g twice daily for 10 days.


Herpes simplex virus, recurrence
Take 500mg twice daily for 3-5 days.
Immunocompromised adult
Take 1g twice daily for 5-10 days.


Herpes simplex, suppression
Take 500mg daily in one or two doses. Reassess recurrence per 6-12 months.


Genital Herpes (reduction of transmission)
Take 500mg daily by the infected partner.


Prophylaxis of cytomegalovirus disease
Adult after organ transplantation
Take 2g 4 times daily for 90 days, start by 72 hours after transplantation.

What are the side effects of Valaciclovir?

Common side effects of Valaciclovir include diarrhea, headache, nausea, vomiting and dizziness.

Who should not take Valaciclovir?

  • Pregnant and breastfeeding women
  • Patients who are allergic to Valaciclovir and any components in the formulation
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Where to buy Valaciclovir in Hong Kong?

In Hong Kong, Valaciclovir is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.


For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk

Need more information?

For detailed information about the use of Valaciclovir in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.

Brands in Hong Kong
Available dosage
  • 500mg / 1000mg (Caplets)
  • 500mg / 1000mg (Tablets)
Drug class
Sub class
Guanine Nucleoside Analogues
Other drugs in same class
Used for: Herpes simplex keratitis, Cytomegaloviral infections
Chinese name:
Used for: Herpes simplex virus infections, Herpes zoster (Shingles)
Chinese name:
Used for: Herpes zoster (Shingles), Herpes simplex virus infections
Chinese name:
Used for: Cytomegaloviral infections, Cytomegaloviral retinitis
Chinese name: