Zanamivir is used to treat flu, or to help prevent you from getting flu during a flu outbreak.
You can help to prevent the flu virus from spreading to others by using clean tissues to cover your mouth and nose when you cough or sneeze, and by washing your hands regularly.
Remember to keep warm, drink plenty of fluids and stay away from crowds.
|Type of medicine||Antiviral|
|Used for||Treating or preventing influenza (flu).|
|Available as||Blisters of powder with a Diskhaler® (inhaler)|
Zanamivir treats influenza (flu) by preventing the viruses causing the infection from spreading once they are inside your body. This reduces the symptoms of the influenza infection. It also reduces the risk of other problems which can sometimes occur alongside flu, such as pneumonia. It is most effective when it is started within an hour or two of the first symptoms of infection, but it can still be effective after this time, as long as it is started within 48 hours for adults, and within 36 hours for children.
Zanamivir is also used to prevent flu when there is a flu outbreak in the community, such as in epidemics and pandemics. It is used for those who have been in close contact with people with flu and for those who would be at particular risk if they developed flu.
Zanamivir is not a substitute for seasonal flu vaccination.
Before taking zanamivir
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking zanamivir it is important that your doctor or pharmacist knows:
- If you are pregnant, trying for a baby or breast-feeding. Although you can take zanamivir if you are expecting or feeding a baby, it is important that your doctor knows about this so that you can be made aware of the benefits and any risks of treatment.
- If you have any breathing problems (such as asthma), or if you are using other inhalers.
- If you are taking or using any other medicines. This includes any medicines you are taking which are available to buy without a prescription, such as herbal and complementary medicines.
- If you have ever had an allergic reaction to a medicine.
How to take zanamivir
- Before you start this treatment, read the manufacturer's printed information leaflet from inside your pack. The leaflet will give you more information about zanamivir and full instructions for using the Diskhaler®.
- Take zanamivir exactly as your doctor tells you to. It is a powder which is inhaled. The powder is contained in blisters in a foil disk which you load into a Diskhaler®. Your doctor or pharmacist will show you how to use the Diskhaler®.
- Zanamivir is a course of treatment which usually lasts 5-10 days although it may sometimes be taken for up to 28 days. Use the Diskhaler® for as long as your doctor has advised, even if you do not feel unwell. If you have been prescribed it because you already have flu symptoms, you will need to use two inhalations (two blisters) twice daily for five days, preferably morning and evening. Start using it as soon as possible. If you are taking it because you have been in contact with someone with flu but do not have any symptoms yourself, then you will need to use two inhalations (two blisters) once a day for at least ten days.
- Try to use the Diskhaler® at the same times each day, as this will help you to remember to use it regularly.
- If you forget to take a dose, take it as soon as you remember (unless it is nearly time for your next dose, in which case leave out the missed dose). Do not take two doses together to make up for a forgotten dose.
Getting the most from your treatment
- Try to help stop the spread of flu to others. You can do this by remembering to use clean tissues to cover your mouth and nose when you cough and sneeze, binning the tissues after use, and washing your hands regularly with soap and hot water.
- Remember to keep warm, drink plenty of fluids and stay away from crowds. If your symptoms do not improve or they get worse, phone your doctor for further advice.
- If you regularly use other inhalers and these are due at the same time as zanamivir, use your usual inhalers a few minutes before you use zanamivir. If you use a reliever inhaler (such as salbutamol) keep this with you while you are using zanamivir, just in case you feel breathless and you need to use it.
Can zanamivir cause problems?
|Possible zanamivir side-effects||What can I do if I experience this?|
|Skin rash||If this becomes troublesome, speak with your doctor|
|Feeling short of breath||Let your doctor know about this|
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
If you are having an operation or dental treatment, tell the person carrying out the treatment which medicines you are taking.
If you buy any medicines, check with a pharmacist that they are suitable to take with your other medicines.
Never take more than the prescribed dose. If you suspect that you or someone else might have taken an overdose of this medicine, go to the accident and emergency department of your local hospital at once. Take the container with you, even if it is empty.
This medicine is for you. Never give it to other people even if their condition appears to be the same as yours.
Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy which will dispose of them for you.
If you have any questions about this medicine ask your pharmacist.
Further reading & references
- Manufacturer's PIL, Relenza® 5 mg/dose inhalation powder; GlaxoSmithKline UK, The electronic Medicines Compendium. Dated March 2011.
- British National Formulary; 64th Edition (Sep 2012) British Medical Association and Royal Pharmaceutical Society of Great Britain, London (links to current BNF)
|Original Author: Helen Allen||Current Version: Helen Allen||Peer Reviewer: Dr Helen Huins|
|Last Checked: 10/12/2012||Document ID: 12253 Version: 2||© EMIS|
Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. EMIS has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.