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Last updated on November 18th, 2021

Generic name: Acyclovir

Brand names: Acyclovir, Zovirax, ACV, USAN, Cyclovir, Herpex, Acivir, Acivirax, Zovir

General Information

Zovirax is an antiviral medicine. It curtails syndromes of chickenpox, shingles, herpes virus infections of mucous membranes (lips and mouth), the brain, the skin, the genitals (sex organs) and widespread herpes virus infections in newborns. Zovirax will not prevent herpes; it helps the sores (if any) heal faster.

Zovirax can change the response of your body to heat. Try not to get overheated or dehydrated. Avoid temperature extremes, such as very hot or cold baths, showers, hot tubs or saunas. Drink plenty of water, especially in hot weather and during exercise.

The combination of alcohol and Zovirax may cause flushing and a fast heart rate.

Your doctor may prescribe this remedy for other purposes. Contact your physician if you need to learn more information about this drug.

Don’t stop treatment with Zovirax earlier than it was prescribed by your doctor even if you notice improvements of your condition. Stopping the medication too early may worsen your condition. Be careful about doing dangerous tasks, driving, operating machinery or climbing until you are aware how this drug affects you. Don’t drink alcohol. Always contact a medic before giving Zovirax to a child.

What symptoms or conditions should I report to a doctor before I take this medicine?

It is important to report to a doctor if you have or had the following conditions:

  •     bowel disease (colitis)
  •     hypertension or any type of heart problems
  •     kidney or liver disease
  •     allergy to acyclovir, other preservatives, foods, dyes, or medicines
  •     dehydration
  •     diabetes
  •     pregnancy, breastfeeding or planning to become pregnant

How to take Zovirax?

Note: This remedy was prescribed to you only. Do not share this medicament with others. Follow strictly your doctor’s prescription. Do not take more or longer than your doctor recommended.

This medicine is offered in the tab and oral suspension (liquid) form to take orally.

The recommended dose of this medication for adults is 200-800 milligrams (mg). The average dose of medicament for children is based on age, kidney function, height, weight and liver function. It is usually recommended to take medicine two to five times daily, at regular intervals.

Zovirax is taken with full glass of water. It is important to drink several glasses of water every day during treatment with Zovirax to protect your kidneys. You may take it with or without food. In order to understate stomach irritation and help your body absorb the drug is desirable to combine with food or milk.

The capsules, tablets should be swallowed whole. Do not crush, open (for capsules), chew or break them. Shake the oral suspension well before measuring a dose to mix the medicament evenly. Use a specially marked measuring spoon or medicine cup to be sure of the correct dose.

What should be done if I missed the dose?

In case you forgot to take the dose, take it at your earliest opportunity. Never double your dose if it is almost time for your next dose. Take only one dose at once.


Taking any medicine in large doses you can have serious consequences for your health. If you feel an overdose, report to your medic at once. Symptoms of overdose may include:

  • hallucinations
  • seizure (convulsions)
  • urinating less than usual or not at all

What drug(s) may interact with Zovirax?

  •     phenytoin
  •     valproic acid
  •     theophylline
  •     tenofovir
  •     probenecid

This list of interactions may be not complete. Provide your medical practitioners entire list of medicines, herbs, dietary supplements or non-prescription drugs you take. Moreover tell them whether you drink alcohol, use illegal drugs or smoke. Particular items may interact with your drug.


Which side effects can I perceive from this remedy?

  •     Nausea, vomiting
  •     Allergic reaction (difficulty breathing; hives; swelling of your throat, tongue, face or lips; itching; skin rash or swelling)
  •     Headache, dizziness, ringing in your ears
  •     Mental, mood changes (e.g., mental depression, mood swings, confusion, hallucinations, blurred vision)
  •     Flu symptoms, chills, fever, body aches
  •     Liver problems, yellowing eyes, skin
  •     Difficulty urinating (urinary retention), dark urine or diarrhea
  •     Fatigue, faintness
  •     Numbness, tingling in your hands or feet (tremor), muscle pain or weakness
  •     Indigestion or upset stomach, bloating, stomach gas, pain or cramps
  •     Redness, blistering, peeling or loosening of the skin, including inside the mouth
  •     Unusual bleeding or bruising
  •     Chest pain, wheezing, difficulty breathing
  •     Loss of appetite

If these persist or worsen, inform your health care provider instantly. This is not a whole list of side effects and others may occur. If you notice other reactions not specified above, contact your doctor or pharmacist.

How should Zovirax be stored?

Zovirax should be stored at room temperature, between 15 and 30 degrees C (59 and 86 degrees F), in a tightly closed container. Protect from moisture, direct heat, and light. Do not store in the bathroom or near a sink. Keep Zovirax out of the reach of children and away from animals.

Warning: Before taking the drug you need to consult your doctor. The information contained in this article is not intended to cover all possible precautions, drug interactions, adverse effects, directions, uses, allergic reactions or warnings.

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