Side Effects of Zanamivir

Difficulty breathing, seizures, and allergic reactions are some of the potentially serious side effects of zanamivir that require immediate medical care. However, in most cases, side effects (if they even occur) are minor and easily treated by you or your healthcare provider. Some of the more common zanamivir side effects include fever, sinus infections, and dizziness.

Side Effects of Zanamivir: An Introduction

As with any medicine, side effects are possible with zanamivir (Relenza®). However, not everyone who takes the drug will experience side effects. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or are easily treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with zanamivir. Your healthcare provider can discuss a more complete list of zanamivir side effects with you.)

Zanamivir Side Effects to Report

There are a number of side effects with zanamivir that you should report to your healthcare provider. Some of these side effects occur quite rarely (so rarely, in fact, that it is difficult to tell whether they are actually caused by zanamivir or other factors). These serious side effects include but are not limited to:
  • Difficulty breathing
  • Wheezing
  • Seizures
  • Abnormal behavior
  • An irregular heart rhythm (arrhythmia)
  • Fainting
  • Signs of an allergic reaction, such as rash, hives, itching, or swelling of the mouth or throat.
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Zanamivir Drug Information

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