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Valacyclovir Tablets

Valacyclovir is an antiviral medicine that treats infections caused by varicella-zoster virus and herpes simplex virus. Doctors prescribe this drug to treat various medical conditions, including chickenpox, cold sores, shingles, and genital herpes. Valacyclovir will not cure your herpes infections but reduce pain & itching, aid sores to heal, and stop new ones from forming. It is a prescription oral drug, and a generic version of brand-name medicine called Valtrex.This medicine should be taken as a doctor directs to attain maximum benefits.

Uses of Valacyclovir

Valacyclovir helps treat viral infections caused by a group of viruses known as herpes simplex viruses.

Here are viral infections that are treated by Valacyclovir tablet:

  • Cold sores
  • Genital herpes
  • Shingles
  • Chickenpox

The working mechanism of Valacyclovir

Valacyclovir belongs to a class of drugs called antiviral medicine that prevents the multiplication of viruses in the human body.

This medication works by stopping the virus from producing new viruses and clearing up infection quickly.

How to use Valacyclovir?

Read the patient information leaflet before starting your treatment with the Valacyclovir tablet.

This medicine works best in your body when it is started at the first sign of an infection.

If you are prescribed Valacyclovir, start it immediately so that it works best to treat your infection and symptoms.

During treatment with valacyclovir tablet, take proper fluids and stay hydrated.

In this way, you can prevent rare but possibly dangerous kidney issues. 

The dosage and length of treatment depend upon the type of infection, response to therapy, and your medical condition.

Doctors recommend Valacyclovir tablets for treating chickenpox in children, depending on their weight.

This medicine will work best only when it is started at the first sign of an outbreak or as a doctor recommends.

It might be possible that Valacyclovir does not work correctly if there is a delay in treatment.

Take Valacyclovir as the first symptom or as soon as possible for shingles or chickenpox after the rash appears.

To treat genital herpes or cold sores, take Valacyclovir at the first sign or when you experience itching, tingling, or burning.

When medicine in your body is kept at a constant level, valacyclovir works at its best.

Take the Valacyclovir tablet at evenly spaced intervals, and ensure you take it simultaneously every day.

Unless the full prescribed amount is finished, it is essential to continue taking valacyclovir.

Without the doctor’s approval, do not change the dosage, skip the dose, or stop taking Valacyclovir early.

If your condition does not improve or worsens, immediately contact a doctor.

Missed dose

If you missed a dose of Valacyclovir, take it immediately when you remember.

However, the missed dosage must be skipped if it's already time for the next prescribed dose.

Take your next scheduled dose of Valacyclovir at a regular time, and never double the dosage to catch up.


If you overdose on Valacyclovir, symptoms like extreme tiredness, loss of consciousness & seizures might be experienced.

Call your doctor immediately if you experience an overdose of this antiviral medication.

Precautions and warnings

Do not take Valacyclovir if you are allergic to it or any other ingredients in this medicine.

This medicine should be consumed only if the doctor prescribes it. Never encourage self-medication or suggest to someone else.

Before starting your treatment with Valacyclovir, inform your doctor about your medical history, especially of:

  • Immune system disorders
  • Kidney problems
  • Liver disease
  • Human immunodeficiency virus infection (HIV)
  • Acquired immunodeficiency syndrome (AIDS)

However, this medicine can rarely make you feel dizzy. It is better to avoid alcohol as it can make you more dizzy.

Do not drive, use heavy machines, or do anything that demands alertness unless you can do it safely.

Cold sores often spread quickly. So, avoid close physical contact with other people during an outbreak unless it is healed.

Make sure you do not touch your cold sore. If you do, then correctly wash your hands afterward.

This medicine does not help prevent the spread of herpes. During an outbreak, do not have sexual contact with your partner.

Pregnant and breastfeeding women must first consult a doctor and then start treatment with a Valacyclovir tablet.

Side effects of Valacyclovir

Like other antiviral medicines, Valacyclovir can also cause mild and severe side effects.

However, mild side effects of Valacyclovir disappear as your body adjusts to this medicine after some time.

Many people using this medicine do not suffer from any serious side effects.

Some common side effects of Valacyclovir include:

  • Nasopharyngitis
  • Headache
  • Increased liver enzymes
  • Nausea
  • Abdominal pain

Serious side effects of Valacyclovir

  • Severe drowsiness
  • Urinating less than usual
  • Confusion
  • Swelling in feet, ankles, or legs
  • Hallucinations
  • Shaky movements
  • Aggressive behavior
  • Seizures

This is not a complete list of side effects. If you experience anything else, then immediately contact a doctor.

Drug Interactions

Drug interactions can completely change how your medicine works or even increase the risk for severe side effects.

Inform the doctor beforehand about all other prescription and non-prescription medicines and herbal supplements you take.

During your treatment with Valacyclovir, avoid certain medications like ibuprofen and naproxen.


Valacyclovir should be stored at room temperature, away from sunlight and moisture.

Frequently asked questions about Valacyclovir

For how long do you need to take Valacyclovir?

The duration of Valacyclovir treatment will depend upon the disease you are being treated for.

Also, the doctor will check whether your immune system can fight against infections.

Can the Valacyclovir tablet cure your herpes infection?

Valacyclovir tablet will only decrease pain & itching caused by herpes infection but not cure it.

This medicine is effective in healing sores and preventing the formation of new ones.

If I feel better, can I stop taking Valacyclovir?

Without talking to your doctor, do not stop taking Valacyclovir tablet.

If valacyclovir is stopped, you can suffer from fever, confusion, severe muscle stiffness, or mental state changes.