Zanamivir

About zanamivir

Zanamivir works by preventing influenza viruses A and B from spreading inside the body. By doing this it reduces or prevents the symptoms of the influenza virus infection. As well as relieving the symptoms of flu, it also shortens the time of illness by around one day and reduces the risk of other problems that can occur alongside flu, such as pneumonia.

It is most effective in reducing the symptoms of flu if it is started within a few hours of the first symptoms of the infection. It can however be started up to 48 hours after the start of the infection in adults and 36 hours in older children.

It is also used to prevent flu when there are high levels of influenza in the community such as in epidemics and pandemics. It is useful for those who have been in close contact with people suffering from influenza at these times, or those who would be at particular risk if they developed flu.

Zanamivir is not a substitute for seasonal flu vaccination.

Before taking zanamivir

Before taking zanamivir make sure your doctor or pharmacist knows:

• If you are pregnant, trying for a baby or breast-feeding.
• If you have breathing problems such as asthma.
• If you are taking other medicines, including those available to buy without a prescription, herbal or complementary medicines.
• If you have ever had an allergic reaction to this or any other medicine.

How to take zanamivir

• Before beginning treatment, read the manufacturer's printed information leaflet which explains how to use the diskhaler.
• Take zanamivir exactly as directed by your doctor.
• Zanamivir is a course of treatment which usually lasts 5-10 days although it may sometimes be taken for up to 28 days. Remember to complete the whole course (even if you do not feel unwell), otherwise your symptoms may return.
• Try to take zanamivir at the same time(s) each day to avoid missing any doses.
• If you forget to take a dose, take one as soon as you remember unless it is time for your next dose. Do not take two doses at the same time to make up.

Getting the most from your treatment

• If you are due doses of any other inhalers at the same time as zanamivir, take your dose of zanamivir after your usual inhaler. If you use a reliever inhaler (such as salbutamol) keep this with you in case you need to use it.

Can zanamivir cause problems?

It is unusual to experience any side-effects of treatment with zanamivir but should you experience any difficulties with breathing then it is important to let your doctor know as soon as possible.

If you experience any other symptoms which you think may be due to this medicine, speak with your doctor or pharmacist.

How to store zanamivir

• Keep all medicines out of the reach and sight of children.
• Store in a cool, dry place, away from direct heat and light.

Important information about all medicines