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Zovirax Side Effects in Pakistan

A complete guide to the side effects of Zovirax. From common effects to serious warnings — everything you need to know is on this page.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated:

Side Effects

Quick Answer

Common side effects of Zovirax include nausea and headache. Serious effects such as kidney function changes require immediate medical attention. Most patients tolerate Zovirax well at the correct dose. Contact your doctor if any side effect persists or worsens.

Side Effects at a Glance

Common

  • Nausea
  • Headache
  • Diarrhea
  • Fatigue

Serious — See a Doctor

  • Kidney function changes
  • Confusion or unusual drowsiness
  • Severe allergic reaction (rash, swelling, difficulty breathing)

When to See a Doctor Immediately

  • Signs of an allergic reaction such as rash, swelling, or difficulty breathing
  • Confusion, unusual drowsiness, or reduced urination
  • Symptoms that do not improve or that worsen after starting treatment

Zovirax Side Effects (Nuksanat)

Zovirax (Acyclovir) is generally safe when taken at the correct dose. However, like all medicines, it can cause side effects in some patients.

Common Side Effects (Aam Nuksanat)

  • Nausea
  • Headache
  • Diarrhea

These side effects are usually mild. If they continue, inform your doctor.

Serious Side Effects (Sanjeedah Nuksanat)

  • Kidney function changes — see a doctor immediately
  • Confusion or unusual drowsiness (especially in patients with kidney impairment) — see a doctor immediately
  • Severe allergic reaction — see a doctor immediately

When to See a Doctor (Kab Doctor Se Milna Zaroori Hai)

  • Signs of an allergic reaction such as rash, swelling, or difficulty breathing
  • Confusion, unusual drowsiness, or reduced urination
  • Symptoms that do not improve or that worsen after starting treatment

Warnings and Precautions (Ihtiyat)

  • Don't use Zovirax if you are allergic to Acyclovir or any ingredient
  • Drink plenty of fluids while taking Zovirax to help protect kidney function, especially at higher doses

Side Effects Summary Table

TypeSide EffectAction
CommonNauseaMonitor / inform doctor
CommonHeadacheMonitor / inform doctor
CommonDiarrheaMonitor / inform doctor
SeriousKidney function changesSee a doctor immediately
SeriousConfusion or unusual drowsinessSee a doctor immediately

Reporting Side Effects

If you notice any unexpected side effect, report it on the DRAP pharmacovigilance portal: https://www.dra.gov.pk/pharmacovigilance

The information in this guide is for educational purposes only. If you notice any side effect, contact your doctor or pharmacist.

Frequently Asked Questions

What are the most common side effects of Zovirax?

The most commonly reported side effects of Zovirax include nausea and headache. These are usually mild and go away on their own. Inform your doctor if they persist.

Can Zovirax cause allergic reactions?

Yes, like all medicines, Zovirax can cause allergic reactions in some people. Signs include rash, itching, swelling, or difficulty breathing. Stop use and seek medical help immediately if this happens.

Is Zovirax safe to take for a long time?

Long-term safety depends on the condition and the patient, particularly kidney function. Your doctor will monitor for any signs of kidney function changes if continued use is needed.

What should I do if I experience side effects from Zovirax?

For mild side effects, inform your pharmacist. For serious effects such as kidney function changes or confusion, stop the medicine and contact your doctor immediately or go to the nearest hospital.

Does Zovirax affect the liver or kidneys?

Zovirax may require dose adjustment in patients with kidney impairment, and adequate hydration is important while taking it. Your doctor will advise based on your test results and overall health condition.

Related medicines

Brand alternatives, same-class options, and other medicines used for the same conditions as Zovirax Tablet.

Brand alternatives

Other Acyclovir brands available in Pakistan.

All brands →

Used for the same conditions

Other medicines commonly used for cold and flu and overlapping conditions.

Cold and Flu hub →

Sources

  1. DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
  2. WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
  3. British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.