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What is Tamiflu?

Tamiflu is an antiviral medicine that helps treat symptoms caused by the flu virus or influenza. It helps in blocking the actions of influenza virus types A and B in your body. It reduces the severity of symptoms (such as stuffy nose, cough, sore throat, fever/chills, aches, and tiredness) and speeds up recovery by 1-2 days.

This medicine can also be used to prevent influenza in people who have been exposed to the virus but have not yet developed symptoms. You can buy Tamiflu online or from a local pharmacy store.

Important Information

Tamiflu is an antiviral medication that helps treat flu symptoms in people who have had them for less than two days. This medicine also helps protect people who have been exposed to influenza but have not yet developed symptoms. This medication will not help you with a common cold.

Tell your doctor before taking Tamiflu if you have received a nasal flu vaccine within the past 2 weeks or if you have kidney disease, heart disease, lung disease, or any other serious disease or health problem. Tell your doctor if you have a condition that causes swelling or a brain disorder.

Even if you start to feel better, keep taking Tamiflu for the prescribed duration. Your symptoms may start to improve even before the infection is fully treated.

Some people taking oseltamivir have reported symptoms such as sudden confusion, delirium, hallucinations, unusual behavior, or self-injury. These signs and symptoms have been seen most frequently in children. It is unclear whether this medication was the root of the symptoms. However, anyone taking this medication should be on the lookout for signs of confusion or unusual behavior. If you or your child is experiencing any of these symptoms, contact your doctor right away.

What to know before taking Tamiflu?

You should not take Tamiflu if you are allergic to oseltamivir.

When treating flu symptoms in children younger than 2 weeks old, do not use oseltamivir. This medication helps prevent flu symptoms in children as young as one year old.

Tell your doctor if you ever had the following conditions:

  • chronic lung disease or heart disease
  • a condition causing swelling or disorder of the brain
  • if you have used a nasal flu vaccine (FluMist) within the past 2 weeks
  • hereditary fructose intolerance
  • kidney disease (or if you are on dialysis)
  • a weak immune system which may be caused by disease or by using certain medicine

It is unclear whether this medication will harm an unborn child. Infection with influenza during pregnancy, on the other hand, can result in birth defects, low birth weight, preterm delivery, or stillbirth. If you are pregnant, your doctor will determine whether you should take oseltamivir.

Pregnant women should get a yearly flu vaccine to prevent influenza, according to the Centers for Disease Control and Prevention (CDC). Oseltamivir should not be used instead of the annual flu shot.

Tamiflu does not appear to pass into breast milk, nor does it appear to harm a nursing baby. If you are nursing a child, let your doctor know.

How to take Tamiflu?

Take Tamiflu as prescribed by your doctor. Read all medication guides or instruction sheets and follow all directions on your prescription label. Take medicine exactly as directed.

When flu symptoms appear, such as fever, chills, muscle aches, sore throat, and a runny or stuffy nose, start taking Tamiflu as soon as possible.

You should take the Tamiflu capsule with a full glass of water.

Shake well the oral suspension (liquid) before you measure a dose.  Use the provided dosing syringe or a medicine dose-measuring device.

Take Tamiflu with food if it upsets your stomach.

Take Tamiflu every 12 hours for 5 days to treat flu symptoms.

Take Tamiflu every 24 hours for 10 days or as directed to prevent flu symptoms. Pay attention to your doctor’s instructions.

Even if your symptoms improve quickly, take this medicine for the full duration recommended. If your symptoms worsen or do not seem to improve, contact your doctor.

Store capsules away from moisture and heat at room temperature.

Refrigerate liquid medications but do not freeze them. After 17 days, discard any unused liquid.

The liquid can be stored at room temperature for up to ten days.

Tamiflu dosage

Dosage for treatment of influenza

The typical flu treatment dosage for adults and children ages 13 years or older is 75 mg taken twice daily by mouth for five days.

Start taking Tamiflu within 2 days of when your flu symptoms began.

Dosage for prevention of influenza

Tamiflu 75 mg once daily is the typical dosage for flu prevention in adults and children aged 13 years and older.

If you have had close contact with someone who has the flu, your doctor may prescribe Tamiflu. Tamiflu can be most effective at preventing the flu when taken within two days of coming into contact with the virus. You should take Tamiflu for at least 10 days for flu prevention.


It is possible to overdose on Tamiflu if you take more than the recommended dosage. Overdose may cause serious side effects. Symptoms of an overdose can include vomiting, nausea, diarrhea, overall pain, headache.

What to avoid while using Tamiflu?

Do not use nasal flu vaccine (FluMist) within 48 hours of taking Tamiflu. Oseltamivir may interfere with FluMist’s drug action, reducing the vaccine’s effectiveness. Pay attention to your doctor’s instructions.

Tamiflu side effects

Some common Tamiflu side effects may include:

  • headache
  • nausea, vomiting
  • pain

Serious side effects

  • unusual behavior
  • sudden confusion
  • tremors or shaking
  • hallucinations (hearing or seeing things that are not there)

Some Tamiflu users (especially children) have experienced sudden unusual changes in mood or behavior. It is unclear whether oseltamivir is the exact cause of these symptoms. Anyone with influenza can develop neurologic or behavioral symptoms even if they are not taking oseltamivir.

What drugs can interact with Tamiflu?

If you have received a flu vaccine in the nose within the last two weeks before starting this medication, tell your doctor. This medication may reduce the effectiveness of a nasal flu vaccine. Wait at least 2 days after finishing this medication before getting a flu shot through the nose. Check all the drug interactions of this medicine if you want to order Tamiflu online.