Tamiflu (Oseltamivir)

Medication features:

  • A prescription only medication
  • Speeds up recovery
  • Lowers the risk of complications


Available strengths:



Price £29.99

Includes free private prescriptions

In stock

Delivery Time


Expected delivery date:

Wednesday, 13 December 2023

If you order within:


Next Day Delivery

Next Day

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UK Registered Pharmacy

UK Registered

Discreet & Confidential

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  • Overview
  • FAQ
  • Side Effects
  • Patient Information Leaflet
  • Reviews

What is Tamiflu (Oseltamivir)

Tamiflu is an anti viral prescription medication used to treat and prevent symptoms of flu (influenza). It is also used in adults, adolescents, children, and infants. Tamiflu contains the active ingredient oseltamivir. Tamiflu be taken if you have had close contact with someone with the flu to prevent the virus from passing onto you. Tamiflu is not an alternative to the flu vaccine. If you have or are at risk of severe flu symptoms, flu vaccines are the most effective way of preventing flu.

Can I buy Tamiflu Online?

You can buy Tamiflu online in UK. It is a prescription only product available at Click Pharmacy. To receive a prescription, you will be asked to fill in an online assessment form. Your answers will be assessed by our prescriber, who will be able to approve medication for you.

Once a prescription is issued, you can order Tamiflu 75mg capsules online anytime and have them sent in discreet packaging to your home through Royal Mail 1st class or next day delivery service.

How does Tamiflu work?

The influenza virus invades the body's cells, replicating itself as it goes so that new virus cells begin to destroy healthy cells. Once a certain number have been affected, the patient starts to feel the effects of the flu, including cold sores, muscle aches, sudden fever and fatigue.

Tamiflu can inhibit the influenza virus' ability to invade the body's cells by binding to its surface, restricting its ability to destroy healthy cells and replicate itself and eventually enabling the body's immunity to kill it. If left too long before taking the medication, the number of cells the virus has destroyed is too great for Tamiflu to help, so taking it within 48 hours of infection is vital.

How effective is Tamiflu?

The European Medicines Agency (EMA) has approved the use of Tamiflu 75mg to treat and prevent influenza viruses. Tamiflu is effective at speeding up your recovery from flu by up to 48 hours if taken within 2 days of the virus starting. If you are specifically suffering from influenza, Tamiflu 75mg is proven to lower the risk of developing more serious complications, including pneumonia by over 40% and hospitalisation by over 60%, whereas, if you are suffering only from flu-like symptoms, the medication will not be effective as part of your recovery.

Once taken, the drug is detected in your blood within half an hour of an oral dose of the medication, and levels are at peak concentration within 3 to 4 hours, demonstrating how quickly it gets to work to fight the influenza virus.

How should I take Tamiflu?

Tamiflu is an oral medicine. Swallow the whole capsule with water with or without a meal. If taken after a meal it can reduce the possibility of feeling nauseous or being sick.
Tamiflu works most effectively when the drug is kept at a constant level in the body. As such, you should take the medication at evenly spaced intervals for as long as directed by your doctor or pharmacist at Click Pharmacy. Even if you feel better, stopping the prescription early can cause a relapse with either the influenza virus returning or a lack of protection against the flu.

How long can I take Tamiflu for?

For treating flu: It is generally recommended that if you have the flu virus, you must take Tamiflu 75mg capsules twice a day for five days.

For preventing flu: If you are taking it for prevention, then you are likely to be recommended to take it once a day for ten days.

Treatment can be prescribed for anywhere between six and twelve weeks for patients with weakened immunity. In case of a missed dose of the Tamiflu capsule, take one as soon you remember, but don't take it less than two hours before your next one. Do not take a double dose of Tamiflu 75mg capsules to replace the missed one.

Can you buy Tamiflu over the counter?

No, Tamiflu is a prescription-only antiviral medication that a registered doctor can prescribe you in the UK. You can also fill out an online questionnaire at Click Pharmacy, and our pharmacist will issue the prescription.

Alternatives to Tamiflu

  • Relenza

An antiviral drug available in inhaler form. It contains the active ingredient zanamivir.

  • Flu jab

The best preventive measure against the flu is getting a flu jab yearly. It is free of cost for eligible individuals in the UK.

What are the side effects of Tamiflu?

There may be some side effects similar to those which occur due to the flu itself, such as dizziness and headaches. Others include stomachaches, nausea, vomiting, diarrhoea, bronchitis, cold sore, muscle pain, runny nose, pain in limbs, sleeping difficulties, sore throat, fever, upper abdominal fullness, cough, upper respiratory tract infections, tiredness and upset stomach.

More serious side effects which require medical help can also occur, and though very rare, they are more common in children. These include anaphylactic shock, sudden confusion or feelings of delirium, seizures, seeing things (hallucinations), a change in mood or behaviour and self-harm.

You should discontinue the product and seek medical help if any of these severe side effects occur or if you experience side effects that suggest an allergic reaction, such as tongue, lips or throat swelling or hives/rash.

Other Warnings to consider

Tamiflu capsules cannot replace the benefits of an early, annual flu vaccine. It can only support the body if taken within 48 hours (2 days) of being infected with the flu. Tamiflu cannot prevent or treat bacterial infections that may develop due to the primary influenza virus. 

There are a number of medications which can interact negatively with Tamiflu. Speak to your doctor about any other medications you currently take before using Tamiflu, including but not limited to:

  • Entecavir
  • Clopidogrel
  • Tafamidis
  • Probenecid
  • Methotrexate
  • Pemetrexed
  • Influenza virus vaccine
  • Warfarin
  • A flu vaccine

Is Tamiflu a substitute for the flu vaccine?

No, Tamiflu is not a substitute for flu vaccine. Tamiflu is an anti viral medicine used for the treatment and prevention of influenza. Your doctor will provide you with the best advice on flu vaccines and their alternatives based on your condition and medical history.

What to avoid when taking Tamiflu?

Here are a list of things you should avoid when Tamiflu:

  • You should avoid being on an empty stomach before taking Tamiflu, as it may upset your stomach.
  • Pregnant and breastfeeding mothers must not take this medication before consulting their doctors.
  • People with heart, lung, and liver must also consult their doctors before taking this medication.

Who should avoid taking Tamiflu?

Adults over the age of 65 years old should avoid taking Tamiflu. Anyone with a history of heart disease, asthma and diabetes should not take Tamiflu.

Can I stop taking Tamiflu after I feel better?

You should always complete your prescribed course for these capsules, even if you feel better before you complete your course.

When will Tamiflu work most effectively?

Tamiflu is substantially more effective if taken within 48 hours of the first symptom of influenza.

Can pregnant women take Tamiflu Tablets?

Studies suggest Tamiflu is safe to use for pregnant and breastfeeding women.

How should I store Tamiflu?

These capsules should be stored safely in a closed container at room temperature, away from direct exposure to sunlight and extreme temperatures.

How often should I take these capsules?

In order to effectively treat influenza, it is recommended to take one 75 mg capsule once a day for the duration of 10 days.

There may be some side effects similar to those which occur due to the flu itself, such as dizziness and headaches. Others include:

Common Side effects

  • Dizziness
  • Headaches
  • Stomachaches
  • Nausea
  • Vomiting
  • Diarrhoea
  • Bronchitis
  • Cold sore
  • Muscle pain
  • Runny nose
  • Pain in limbs
  • Sleeping difficulties
  • Sore throat
  • Fever
  • Upper abdominal fullness
  • Cough
  • Upper respiratory tract infections
  • Tiredness
  • Upset stomach

Serious side effects:

  • Anaphylactic shock
  • Sudden confusion
  • Feelings of delirium
  • Seizures
  • Seeing things (hallucinations)
  • A change in mood or behaviour and self-harm

You should discontinue the product and seek medical help if any of these severe side effects occur or if you experience side effects that suggest an allergic reaction, such as tongue, lips or throat swelling or hives/rash.

Always read the patient information leaflet before starting your treatment. The patient information can be found here.

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