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Instructions for use Zovirax



Other names: 2-Amino-9-(2-hydroxyethoxy)methyl-1,9-dihydro-6H-purin-6-on

Bioavailability: 0-50%

ATC-Code: J05AB01

Protein binding: ≥ 10%

Metabolism: Liver


Half-life: 2-4 hours

Excretion: Kidneys

CAS number: 59277-89-3

PubChem-CID: 2022

Drug Bank: DB00787

ChemSpider: 1945


KEGG: D00222



ECHA-InfoCard: 100.056.059

Formula: C8H11N5O3

Molar mass: 225.208 g·mol−1

How does it work?

Zovirax is an antiviral (antiviral) drug that is effective against herpes simplex virus infections and herpes zoster. The active ingredient is called acyclovir. The mode of action consists in inhibiting the proliferation of herpes viruses.

How is it used?

Take this medication orally with or without food. It is taken with plenty of liquid. This medication should not be taken before bedtime.

The dosage depends on the medical condition and the response of the disease to therapy. In children, the dosage is related to body weight.

For the treatment of infections caused by herpes simplex, the dose of 200 mg is prescribed five times a day, every 4 hours. The treatment usually lasts 5 days.

For treating shingles and chickenpox, the dose is 800 mg five times a day, every 4 hours. In this case, Zovirax tablets are taken for 7 days.

Zovirax tablets work best when used immediately after the first sign of herpes. The preparation may not work as well if you delay treatment.

Side effects





Stomach pain

Skin rash



Warnings and Precautions

Beware of kidney problems

If you suffer from kidney problems, your doctor may adjust the dose.

Be careful if you have an intolerance to lactose

Zovirax 200 mg tablets contain lactose. Seek medical advice if you cannot tolerate certain sugars.

Other trade names

Acic Aciclostad Acivir Acyclovir


Hypersensitivity to the ingredients


Not safe


No interactions with alcohol

What happens if you miss the dose?

Do not take a double dose to make up for a forgotten dose. For the next dose, do not take more than the usual recommended amount.


If you take more than you should, tell your doctor. There could be side effects.


Interactions are unlikely or not significant

Nevertheless, tell your doctor if you are taking or have recently taken any other medication.

Unwanted reactions

Allergic reaction



Speech disorders






Food does not affect the effects of the drug.


Keep this medicine out of the sight and reach of children.

Do not store above 25°C.

Store in the original package in order to protect from light and moisture.

Frequently Asked Questions

What are tablets Zovirax suitable for?

Zovirax tablets are used to treat infections caused by herpes simplex and herpes zoster.

Are Zovirax tablets available over the counter?

No, Zovirax tablets require a prescription and therefore require a prescription.

How are Zovirax tablets used for shingles?

For the treatment of shingles, the dose is 800 mg 5 times a day, every 4 hours. The duration of treatment is usually one week. For prophylaxis against pain caused by shingles, therapy should be initiated no later than 72 hours after the onset of skin injuries.

What side effects are common after taking Zovirax?

Common side effects of Zovirax tablets include headache, dizziness, itching, rash, fatigue and fever.

Why buy Zovirax tablets?

Zovirax is a drug from the group of antivirals and is used to combat herpes infections of the skin and mucous membranes. The active ingredient is called acyclovir. Zovirax is effective against different types of herpes virus including cold sores, primary and recurrent genital herpes; shingles and chickenpox.

In people who have frequent flare-ups, Zovirax is used to reduce the number of future episodes. Zovirax is an antiviral drug. However, it is not a cure for these infections. The viruses that cause these infections live on in the body between outbreaks. Zovirax reduces the severity and duration of these outbreaks. It helps the wounds to heal faster, prevents new wounds from forming and relieves pain/itching. This medicine can also help reduce the duration of pain after the wounds heal. In addition, in people with a weakened immune system, Zovirax can reduce the risk of the virus spreading to other parts of the body and causing serious infections.

In which dosage forms can Zovirax be bought?

The drug Zovirax is available as tablets, cream, eye ointment and oral suspension. The tablets are available in 3 strengths on the market: 200mg, 400mg and 800mg. The lip cream contains 5 mg/g aciclovir. As an oral suspension, Zovirax is available in 400 mg/5 ml dosage.

How much do Zovirax tablets cost in the pharmacy?

The price of Zovirax varies depending on the dosage and the package size. It also plays a role here whether you buy an original preparation Zovirax or a generic Aciclovir. Since there are several generic manufacturers, the prices also differ.

For example, 25 pieces of Aciclovir ratiopharm 200 mg tablets cost from €14.10. For a pack of 100 pieces you should pay from 24.88 euros. The price for 35 pieces starts at €19.03 for 400 mg tablets and €25.49 for 800 mg tablets accordingly.

If the generic aciclovir is manufactured by Aristo Pharma GmbH, the price for 25 tablets starts at €14.09. 100 tablets in the same dosage cost from 24.55 euros. If you want to buy Aciclovir Aristo in the 400 mg dosage, you will pay from €19.02 for a pack of 35 pieces and from €26.78 for a pack of 70 pieces. The price for 35 tablets of 800mg is at least 25.05 euros.

The price for Aciclovir 200-1A Pharma and ACICLOVIR AL 200 ranges from €13.92 for 25 pieces to €22.55 for 100 pieces, while Aciclovir 400-1A Pharma from €18.91 for 35 pieces and from €26.78 euros for 70 pieces.

Can you take Zovirax tablets during pregnancy?

If you are pregnant, you can take Zovirax tablets only after consulting your doctor. The US Food and Drug Administration (FDA) has classified aciclovir (Zovirax) as a Pregnancy Category B drug. This means that studies conducted on animals have shown a low risk, but there are no adequate and well-controlled studies in pregnant women.

The American Sexual Health Association (ASHA) states that the FDA has not approved a drug to treat herpes during pregnancy. However, many doctors prescribe aciclovir (Zovirax) in the last few weeks of pregnancy when the potential benefits outweigh the potential risks.

According to the American Academy of Family Physicians, taking Zovirax in the first trimester does not increase birth defects. Therefore, Zovirax is recommended as the "antiviral of choice" in the first few weeks of pregnancy. Studies on the effects of Zovirax in the 2nd and 3rd trimester of pregnancy are limited.

Can Zovirax be considered in children?

You can already treat babies with a herpes simplex infection or chickenpox with Zovirax. However, prior to administration, a doctor's consultation is required. Tell your child's doctor if your child has had an unusual or allergic reaction to aciclovir, valacyclovir, famciclovir, or any other medicines in the past. Keep a list of all the medicines your child is taking and show it to the doctor or pharmacist. If your child has kidney problems, precautions may need to be taken with this medicine.

If your child's symptoms do not improve after a few weeks of treatment, or if they worsen, contact your child's doctor.


  1. Yellow List: Aciclovir
  2. JG Spangler, JK Kirk, MP Knudson. Uses and safety of acyclovir in pregnancy
  3. American Academy of Family Physicians : Acyclovir Safe for Treating Herpes Infection in Early Pregnancy.
  4. Bjorn Pasternak, Anders Hviid. Use of Acyclovir, Valacyclovir, and Famciclovir in the First Trimester of Pregnancy and the Risk of Birth Defects; JAMA Network (2010).

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1 Review(s)

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My husband has been plagued by herpes for about 2 years and therefore tries everything that promises success. Until recently, he wasn't really happy with any of the products. But 3 months ago he found something really good that really helps against the herpes itself. These are the Zovirax tablets. Really recommended!


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