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Valacyclovir: uses, side effects & brands
Valacyclovir is a convenient form of acyclovir for herpes and shingles. It belongs to the Antiviral group. Antivirals treat specific viral infections such as herpes, shingles or influenza.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Antiviral |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Shingles (herpes zoster)
- Genital herpes — treating outbreaks and preventing recurrences
- Cold sores
- Reducing the chance of passing genital herpes to a partner (with safer sex)
Common brand names
- India: Valcivir, Valtoval, Vdevelox
- Worldwide: Valtrex
Common side effects
- Headache
- Nausea or tummy pain
- Dizziness
Before taking it — precautions
- Drink plenty of fluids
- Tell your doctor about kidney problems or if you are older
- Pregnancy, breastfeeding or weak immunity — tell your doctor
When to see a doctor urgently
- Passing very little urine or swelling (urgent)
- Confusion, agitation or hallucinations
- Severe allergy or blistering rash (urgent)
Not a prescription — no dose shown. The right dose of valacyclovir depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.
Frequently asked questions
How is valacyclovir different from acyclovir?
It turns into acyclovir in the body but is absorbed better, so it is taken less often.
Does it cure herpes?
No — it controls outbreaks and lowers recurrences but does not remove the virus.
When should I start it for shingles?
As soon as possible after the rash appears, ideally within the first few days.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.