Zovirax 400 Mg

Last Updated on 05/08/2026 ✔ Medically Reviewed by Dr. Arjun Srivastav

What is Zovirax 400 mg?

Zovirax 400 mg is a powerful antiviral medication used to treat a variety of viral infections. In particular, it is effective against genital herpes, herpes simplex, shingles, and chickenpox.

Acyclovir is the active ingredient in Zovirax 400 mg, a well-known antiviral compound used to treat viral infections.

Composition

Each Zovirax 400 mg tablet contains:

• Acyclovir — 400 mg

This active ingredient belongs to a class of drugs called antivirals, specifically designed to target viral infections rather than bacterial ones.

Uses of the Zovirax 400 mg

Zovirax 400 mg is a commonly prescribed medication used for the treatment of:

• Genital Herpes: Treating initial outbreaks or recurring episodes.

• Cold Sores: Controlling Herpes Simplex Virus (HSV-1).

• Chickenpox: Reducing the severity of the virus in both children and adults.

• Shingles: Managing the varicella-zoster virus in adults.

How does Zovirax 400 mg work?

Zovirax 400 mg works by preventing viral replication in your body. You will feel relaxed as it treats viruses and infections in your body.

In addition, regular use of this medicine prevents the production of new viruses in your body, which slows the viral infection and helps clear it up.

This helps:

• Reduce the severity of symptoms
• Shorten healing time
• Prevent the infection from spreading further

👉 Important: Zovirax 400mg does not eliminate the virus; it helps control it.

How to Take Zovirax 400 mg Tablet

It is essential to take the drug at the proper duration and dose. Gulp down a whole pill of the drug with water. Do not split or squash a pill, which may reduce the action of the medicine.

You can ingest the drug when your stomach is empty. Keep in mind to consume the medicine at a fixed time each day.

How long does it last?

• Relief may begin within 1–2 days
• Full healing may take 5–10 days

👉 Early treatment gives the best results—start as soon as symptoms appear.

What does Zovirax 400 mg consist of?

Zovirax 400 mg is an antiviral tablet made up of one main active ingredient along with several supporting inactive ingredients (excipients) that help the tablet work effectively.

Zovirax 400 mg Dosage

Adult dosage

• The 400 mg dose is given only to curb mild viral care.
• For more severe issues, a higher dose is prescribed.
• The 400 mg dose generally cures mild infections within a week or two of regular use.
• For more severe issues in adults, the doctors can tell you to use 2 to 4 pills per day with a maximum combined dose of 1000 mg taken after suitable time intervals.

Dose for a child

Generally, the doctors check the type of infection, the age, and the health of the child to give a suitable daily dose for a week or 15 days.

What occurs if I overdose on this medicine?

Using a higher strength of the medicine or at frequent intervals can increase the strength of the medicine, which is not suitable for your health. Under this condition, your body may develop different side effects.

What occurs if I miss taking a dose?

Studies done by the EMA found that Zovirax 400 mg only shows gradual effects. It may take at least a few days to see little effect. However, if you miss taking your dose often or every few days, it may take longer than usual to cure the infection.

Side Effects

Common Side Effects

Here is a list of the most common issues-

• Headache
• Dizziness
• Fatigue
• Drowsiness

Sometimes the patient can have a few of these mild effects at the start of the course for a few days. However, by day 5, these issues should go away completely without any more problems. In any other case, you need to talk with the doctors.

Intense effects

• Diarrhea with blood
• Severe stomach pain
• Flushing

You may have to stop using the medicine with these side effects had so better to get to the doctors.

Precautions and warnings

• Pregnancy

Zovirax 400 mg studies and effects have been done in pregnant animals, such as rats. In addition, as per these studies, the effect of the medicine is not suitable for the growth of the baby.

• Breastfeeding

Studies done by scientists at the EMA found traces of the drug present in breastmilk after a few days of taking the medicine.

Avoid taking the medicine for a long time unless your baby is a little grown and can take any other types of baby food other than breast milk.

• Addictions

It is better to get rid of addiction to alcohol to avoid the chances of any severe side effects.

• Driving

Conditions like a few mild problems, such as headaches and dizziness, can affect driving.

When to seek medical help?

You should contact your healthcare provider if you experience:

• For initial diagnosis and recognizing the symptoms to find out the type of infection.
• For finding the ideal dose.
• To consult with the doctors in case any side effects arise.

Storage and disposal guidelines

Store the Zovirax 400 mg pills always outside of the fridge. However, try to maintain conditions such as low humidity and a temperature of less than 30 degrees. Once used, dispose of the sachet in a separate disposable bag to avoid contamination.

Is Zovirax 400 mg legal in Sydney?

Yes, Zovirax 400 mg medicine is a completely legal brand to buy and use in Sydney, as the TGA has approved it for use in Australia.

Where can I buy Zovirax 400 mg in Australia?

Buy Zovirax 400 mg and all the other strengths of the medicine easily from Australiarxmeds is the best website where you can buy Zovirax 400 mg online.

To check, it is very important to read Zovirax 400 mg reviews before buying it.