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What is Tamiflu?

Tamiflu is a flu treatment that is clinically proven to ease and prevent the symptoms of the flu virus. Tamiflu can reduce the length of time that you are ill.


Tamiflu has been clinically proven to reduce the duration of the flu by up to 30% when taken in the first 48 hours.


You should take Tamiflu as soon as possible for maximum effect.

Tamiflu is not a substitute for an annual flu vaccine
Do not store above 30°C
Take as prescribed

How does Tamiflu work?

The active ingredient in Tamiflu is oseltamivir, which belongs to a group of medicines called neuraminidase inhibitors. Oseltamivir prevents the flu virus from spreading inside the body.

How do you take Tamiflu?

Swallow the capsules whole with water. Tamiflu can be taken with or without food, although taking it with food can reduce the chance of feeling or being sick.


The recommended dose for treating the flu in adults, is to take two capsules daily. It is usually convenient to take one dose in the morning and one in the evening. It is important to complete the whole 5-day course, even if you start to feel better before that.


The recommended dose for preventing the flu or after having been exposed to an infected person is one dose daily for 10 days. It is best to take this dose in the mornings with breakfast.


The recommended dose is based on your body weight. Always take this medicine as it has been prescribed to you by your doctor or pharmacist.


In adults and adolescents over 13 years, for treating the flu take 75 mg twice daily. For preventing the flu, take 75 mg once daily.

How effective is Tamiflu?

Tamiflu has been clinically proven to reduce the duration of the flu by up to 30% when taken in the first 48 hours. In addition to taking Tamiflu, you should rest and drink a lot of water. It is really important to stay hydrated while having the flu.

What are the main side effects of Tamiflu?

Like all medicines, Tamiflu can cause side effects. However, not everybody will experience these side effects and they are usually mild to moderate in nature. The side effects may also be caused by the influenza virus itself.


The most common side effects of Tamiflu are:

  • Headache
  • Nausea
  • Cough


For less frequent side effects please see the patient information leaflet.

* Disclaimer: Results and individual responses to treatments may vary from person to person. If you do need medical advice you should always speak to a doctor, pharmacist or appropriate medical professional.