Relenza (Zanamivir)
Complete patient guide for uses, dosage, side effects, and safety information
Quick Facts
What Is Relenza Used For?
Relenza is an antiviral medication that helps treat influenza, a viral infection. It can also be used to prevent influenza in specific situations.
Primary Uses
Relenza is primarily used to treat influenza and may be prescribed for prevention in cases where vaccination is not suitable.
How It Works
Relenza works by targeting a specific chemical on the surface of the influenza virus, preventing it from multiplying and spreading in the respiratory system.
Good to know: Relenza is not addictive.
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How to Take Relenza
Relenza is inhaled using a DISKHALER device, allowing the medication to reach the lungs directly.
Dosage Instructions
For treating influenza, inhale the contents of two blisters twice a day for five days. For prevention, inhale the contents of two blisters once daily.
What If You Miss a Dose?
If you miss a dose, take it as soon as you remember. If it's almost time for your next dose, skip the missed dose and continue with your schedule. Do not double up on doses.
Important: Never take a double dose to make up for a missed one.
Available Tablet Strengths
Side Effects
Like all medications, this medicine can cause side effects. Most are mild and temporary, but some require medical attention.
Common Side Effects
These side effects occur relatively frequently and usually don’t require emergency care:
- Feeling lightheaded
- Fainting
Seek immediate medical attention if you experience:
- Allergic reactions
- Shortness of breath
- Wheezing
- Severe skin rash
- Extensive peeling of skin
Impulse Control Issues
Patients, especially children and adolescents, may experience unusual behavior or impulse control issues while taking Relenza.
Important Warnings
There are several important considerations to keep in mind before using Relenza.
Who Should Not Take Relenza
Do not use Relenza if you have a known allergy to zanamivir or any of its ingredients, or if you have severe lactose intolerance.
Medical Conditions to Discuss
Consult your doctor if you have asthma or other breathing problems, or if you are taking other medications.
Pregnancy and Breastfeeding
Relenza should not be taken if you are pregnant, breastfeeding, or planning to become pregnant unless advised by your doctor.
Elderly Patients With Dementia: There is limited experience with Relenza in elderly patients, particularly those with dementia.
Drug Interactions
Certain medications may interact with Relenza, affecting its effectiveness.
Grapefruit interaction: No specific grapefruit interaction mentioned.
- Other antiviral medications
- Over-the-counter cough and cold medicines
Alcohol & Driving
Be cautious when driving or operating machinery until you know how Relenza affects you.
Alcohol
No specific warnings regarding alcohol consumption were mentioned.
Driving and Operating Machinery
Exercise caution when driving or using machinery until you understand how Relenza affects your ability.
Temperature Regulation
No specific temperature regulation warnings were mentioned.
Storage
Store Relenza below 30°C in its original packaging, away from moisture and heat. Keep out of reach of children.
Overdose Information
If you suspect an overdose, seek immediate medical attention. Contact your doctor or the Poisons Information Centre at 13 11 26.
Frequently Asked Questions
Relenza is most effective when taken as soon as possible after influenza symptoms appear, ideally within 48 hours.
Relenza can be taken regardless of food intake, as it is inhaled directly.
No, Relenza is not considered addictive.
Consult your doctor before stopping Relenza, as it is important to complete the prescribed course.
There are no specific warnings against alcohol consumption while taking Relenza.
Weight gain is not listed as a side effect of Relenza.
Elderly patients should use Relenza with caution, especially those with pre-existing conditions.
If you miss a dose, take it as soon as you remember, but do not double up on doses.
Important Disclaimer
This information is intended for general educational purposes only and should not be considered medical advice. Always consult your healthcare provider or pharmacist before starting, stopping, or changing any medication.
If you think you may have a medical emergency, call your doctor or emergency services immediately.