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Flu Symptoms

If you experience sudden onset of fever, aches, chills, or extreme tiredness, you may have the flu. Tamiflu is an antiviral that attacks the flu virus at its source and helps stop it from spreading in the body.

Primary symptoms

  • Fever
    Your temperature is considered elevated when it is 100°F or greater.
  • Aches
    Body aches that are sudden and unexplained can be a sign of the flu.
  • Chills
    Body chills not related to a cold environment can be a sign of the flu.
  • Tiredness
    Tiredness is a feeling of exhaustion or lack of energy. When associated with one or more of the other symptoms, this can be a sign of the flu.

Other symptoms

  • Headache
    A headache associated with the flu may appear suddenly and be accompanied by body aches or nasal congestion.
  • Sore throat
    Swelling in the throat can make it sore.
  • Runny or stuffy nose
    A runny or stuffy nose may occur, but is more common in children than adults.
  • Stomach symptoms
    These include nausea, vomiting, and diarrhea. They are more common in children than adults.
  • Chest discomfort, cough
    Chest discomfort is often severe with the flu.

This is not a substitute for a professional medical diagnosis. However, these symptom descriptions may help you understand your symptoms and get the treatment you need.

About the flu

  • The flu is a contagious virus.2,3
  • Flu season is from late November through March.2
  • A flu shot is your best protection against the flu.2
  • Over-the-counter medicines may help relieve flu symptoms but don’t shorten the time you’re sick.2
  • A typical case of the flu can last a few days to up to 2 weeks.4

A flu vaccination is your best chance at not getting the flu. But it’s possible to get vaccinated and still get the flu because your vaccination may not protect against all strains of the flu.2

Tamiflu may be an effective way to help treat or prevent the flu. Antiviral medicines like Tamiflu fight the flu by attacking the actual flu virus. The Centers for Disease Control (CDC) recommends antiviral flu medicines like Tamiflu to help treat the flu.32,33

If you start feeling any flu symptoms such as sudden fever, aches, chills, and extreme fatigue, call your doctor right away and ask about Tamiflu. Use our Doctor Discussion Guide.

Tamiflu is a prescription medication and is not sold over the counter.

Tamiflu for Adults

Tamiflu is an FDA-approved prescription medicine used to treat the flu (influenza) in people 2 weeks of age and older who have had flu symptoms for no more than 2 days.

In a clinical trial, Tamiflu helped adult patients get better up to 1.3 days (30%) faster compared with people who didn’t take Tamiflu within 48 hours of their first symptoms.1,4 So the sooner you start Tamiflu, the sooner you may start feeling better.

Tamiflu must be prescribed by a doctor, so if you experience sudden fever, aches, chills, or tiredness, call your doctor right away.1

Who can take Tamiflu1

Tamiflu is a prescription medicine used to treat the flu (influenza) in people 2 weeks of age and older who have had flu symptoms for no more than 2 days. Tamiflu can also reduce the chance of getting the flu in people 1 year and older.

You should not take Tamiflu if:

  • You are allergic to oseltamivir phosphate or any of the ingredients in Tamiflu.

Tell your doctor if:

  • You are pregnant, nursing, have heart problems, breathing problems, a weakened immune system (immunocompromised), kidney problems or other medical conditions as Tamiflu may not be right for you.
  • About any medications you are taking or if you’ve received a nasal-spray flu vaccine in the past two weeks.
  • You have an allergic reaction or a severe rash with Tamiflu. Stop taking it, and contact your doctor right away. This may be very serious.

How to take Tamiflu1

  • Tamiflu is available in a fruit-flavored liquid form called Tamiflu for Oral Suspension (6 mg/mL).
  • Tamiflu is also available in capsule form.

Flu treatment for adults and teens aged 13 years and older

  • Take 1 dose, twice daily, for 5 days (see flu treatment chart below for dose amount).

Flu prevention for adults and teens aged 13 years and older1

  • Take 1 dose, once daily, for 10 days or as long as prescribed.
  • One dose is 75 mg/12.5 mL for adults and teens weighing 88.1 lbs/40.1 kg or more.
Flu Treatment and Prevention Dosing for Adults and Teens 13 Years and Older
Treatment dosing for 5 days 75 mg twice daily
Prevention dosing for 10 days 75 mg once daily
Volume of oral suspension
(6 mg/mL) for each dose**
12.5 mL
Number of bottles of oral suspension to dispense 3 bottles
Number of capsules and strength to dispense§ 10 capsules, 75 mg
**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

§

Oral Suspension is the preferred formulation for patients who cannot swallow capsules.

You can take Tamiflu with or without food. There is less chance of stomach upset if you take it with a light snack or a meal.

You can take Tamiflu for up to 6 weeks if you are exposed to the flu because of an outbreak in your community. Follow your doctor’s advice on how long to take Tamiflu.

What to do if you miss your Tamiflu dose1

If you forget to take your medicine, take the missed dose as soon as you remember, unless it is 2 hours or less before your next scheduled dose. Then continue to take Tamiflu at the usual times. Do not take 2 doses at a time to make up for a missed dose. If you miss several doses, tell your doctor and follow the advice given to you.

Taking Tamiflu with other medications1

Your doctor or healthcare professional (HCP) may recommend taking over-the-counter medications to reduce severity of symptoms while the antiviral action of Tamiflu takes effect on the flu virus. As with any medication, be sure to discuss with your doctor any over-the-counter or prescription medicines you are currently taking before beginning Tamiflu therapy.

How to store Tamiflu1

  • Store Tamiflu capsules at room temperature between 68°F to 77°F (20°C to 25°C).
  • Store Tamiflu for oral suspension in the refrigerator for up to 17 days between 36°F to 46°F (2°C to 8°C).
  • Store Tamiflu for oral suspension for up to 10 days at room temperature between 68°F to 77°F (20°C to 25°C).

  • Safely throw away any unused Tamiflu that is out of date or no longer needed.


How to administer liquid Tamiflu1

If you are taking Tamiflu for Oral Suspension, your pharmacist should give you the appropriate dosing device. There is not a dosing syringe in the carton. Follow your doctor’s instructions on how to take Tamiflu and which dose to take.

Please see the Tamiflu full Prescribing Information for complete safety information.

Tamiflu for Children

Tamiflu is an FDA-approved prescription medicine used to treat the flu (influenza) in children 2 weeks of age and older who have had flu symptoms for no more than 2 days. Tamiflu works differently from over-the-counter remedies. Tamiflu attacks the virus at its source, which helps stop it from spreading in the body.

In a clinical trial, Tamiflu helped children aged 1-12 years get better up to 1.5 days (26%) faster compared with children who didn’t take Tamiflu within 48 hours of their first symptoms.1,4 So the sooner they start Tamiflu, the sooner they may start feeling better.

Tamiflu must be prescribed by a doctor, so if your child experiences sudden fever, aches, chills, or tiredness, call your doctor right away.1

Who can take Tamiflu1

Tamiflu is a prescription medicine used to treat the flu (influenza) in people 2 weeks of age and older who have had flu symptoms for no more than 2 days. Tamiflu can also reduce the chance of getting the flu in people 1 year and older.

Before administering Tamiflu, please tell your doctor if your child:

  • Has heart problems, breathing problems, a weakened immune system (immunocompromised), kidney problems or other medical conditions.
  • Is allergic to oseltamivir phosphate or any of the ingredients in Tamiflu.
  • Is taking any medications or if they’ve received a nasal-spray flu vaccine in the past two weeks.

If after administering Tamiflu your child has an allergic reaction or a severe rash, discontinue usage immediately. Contact your doctor right away. This may be very serious.

How to administer Tamiflu1

  • Tamiflu is available in a fruit-flavored liquid form called Tamiflu for Oral Suspension (6 mg/mL).
  • Tamiflu is available in capsule form.

Flu treatment for children 2 weeks of age to 12 years old

  • Take 1 dose, twice daily, for 5 days (see Tamiflu dosage chart below for dose amount).

Flu prevention for children from 1 to 12 years old

  • Take 1 dose, once daily, for 10 days or as long as prescribed (see Tamiflu dosage chart below for dose amount).

Children — 2 Weeks of Age to Less Than 1 Year

Treatment dosing for 5 days 3 mg/kg twice daily
Prevention dosing for 10 days Not applicable*
Volume of oral suspension
(6 mg/mL) for each dose**
0.5 mL/kg
Number of bottles of oral suspension to dispense 1 bottle
Number of capsules and strength to dispense§ Not applicable
*

Tamiflu is not approved for prophylaxis of patients less than 1 year of age.

**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

For patients less than 1 year of age, provide an appropriate dosing device that can accurately measure and administer small volumes.

§

Oral suspension is the preferred formulation for patients who cannot swallow capsules.

Children — Weight Is 33 lbs (15 kg) or Less

Treatment and Flu Prevention Dosing for Patients 1 Year of Age and Older Based on Body Weight
Treatment dosing for 5 days 30 mg twice daily
Prevention dosing for 10 days 30 mg once daily
Volume of oral suspension
(6 mg/mL) for each dose**
5 mL
Number of bottles of oral suspension to dispense 1 bottle
Number of capsules and strength to dispense§ 10 capsules, 30 mg
**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

§

Oral suspension is the preferred formulation for patients who cannot swallow capsules.

Children — Weight Is 33.1 to 51 lbs (15.1 to 23 kg)

Treatment and Flu Prevention Dosing for Patients 1 Year of Age and Older Based on Body Weight
Treatment dosing for 5 days 45 mg twice daily
Prevention dosing for 10 days 45 mg once daily
Volume of oral suspension
(6 mg/mL) for each dose**
7.5 mL
Number of bottles of oral suspension to dispense 2 bottles
Number of capsules and strength to dispense§ 10 capsules, 45 mg
**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

§

Oral suspension is the preferred formulation for patients who cannot swallow capsules.

Children — Weight Is 51.1 to 88 lbs (23.1 to 40 kg)

Treatment and Flu Prevention Dosing for Patients 1 Year of Age and Older Based on Body Weight
Treatment dosing for 5 days 60 mg twice daily
Prevention dosing for 10 days 60 mg once daily
Volume of oral suspension
(6 mg/mL) for each dose**
10 mL
Number of bottles of oral suspension to dispense 2 bottles
Number of capsules and strength to dispense§ 20 capsules, 30 mg
**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

§

Oral suspension is the preferred formulation for patients who cannot swallow capsules.

Children — Weight Is 88.1 lbs (40.1 kg) or More

Treatment and Flu Prevention Dosing for Patients 1 Year of Age and Older Based on Body Weight
Treatment dosing for 5 days 75 mg twice daily
Prevention dosing for 10 days 75 mg once daily
Volume of oral suspension
(6 mg/mL) for each dose**
12.5 mL
Number of bottles of oral suspension to dispense 3 bottles
Number of capsules and strength to dispense§ 10 capsules, 75 mg
**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

§

Oral suspension is the preferred formulation for patients who cannot swallow capsules.

Adults and Teens

Treatment and Flu Prevention Dosing for Patients 13 Years of Age and Older||
Treatment dosing for 5 days 75 mg twice daily
Prevention dosing for 10 days 75 mg once daily
Volume of oral suspension
(6 mg/mL) for each dose**
12.5 mL
Number of bottles of oral suspension to dispense 3 bottles
Number of capsules and strength to dispense§ 10 capsules, 75 mg
**

An oral dosing dispensing device that measures the appropriate volume in mL should be utilized with the oral suspension.

§

Oral suspension is the preferred formulation for patients who cannot swallow capsules.

||

For patients 13 years of age and older who weigh less than 88.1 lbs please refer to the dosing section based on body weight.

No recommended dosing regimens are available for patients with end-stage renal disease undergoing routine hemodialysis or continuous peritoneal dialysis treatment.1

  • You can administer Tamiflu with or without food. There is less chance of stomach upset if you give your child Tamiflu with a light snack or a meal.

You can take Tamiflu for up to 6 weeks if you are exposed to the flu because of an outbreak in your community.

Follow your doctor’s advice on how long to take Tamiflu.

How to administer liquid Tamiflu1

If you are taking Tamiflu in Oral Suspension dosing, your pharmacist should give you the appropriate dosing device. There is not a dosing syringe in the carton. Follow your doctor’s instructions on how to take Tamiflu and which dose to take.

What to do if your child misses a Tamiflu dose1

If you forget to administer your child’s medicine, give the missed dose as soon as you remember, unless it is 2 hours or less before the next scheduled dose. Then continue to administer Tamiflu at the usual times. Do not administer 2 doses at a time to make up for a missed dose. If you miss several doses, tell your child’s doctor and follow the advice given to you.

Taking Tamiflu with other medications1

Your doctor may recommend taking over-the-counter medications to reduce severity of symptoms while the antiviral action of Tamiflu takes effect on the flu virus.

As with any medication, be sure to discuss with your doctor any over-the-counter or prescription medicines your child is currently taking before beginning Tamiflu therapy.

How to store Tamiflu1

  • Store Tamiflu capsules at room temperature between 68°F to 77°F (20°C to 25°C).
  • Store Tamiflu for oral suspension in the refrigerator for up to 17 days between 36°F to 46°F (2°C to 8°C).
  • Store Tamiflu for oral suspension for up to 10 days at room temperature between 68°F to 77°F (20°C to 25°C).

  • Safely throw away any unused Tamiflu that is out of date or no longer needed.


Tamiflu must be prescribed by a doctor, so if you start feeling flu symptoms, call your doctor right away.

Please see the Tamiflu full Prescribing Information for complete safety information.

Flu To-Dos

If you are experiencing sudden onset of fever, aches, chills, or extreme tiredness, you may have the flu.

Check your symptoms now

Call Your Doctor

This Doctor Discussion Guide will help you
talk to your doctor about your symptoms or
concerns. Simply fill out the form, print it,
and bring it with you to your doctor.

Keep in mind, you can only get Tamiflu through a prescription from your doctor.

The following are common flu symptoms.4 Check the ones that you are experiencing:

When did the first symptoms appear?

For best results, take Tamiflu within the first 48 hours of experiencing symptoms.

Have you or other family members been exposed to someone who has flu symptoms?

Please note: We respect your privacy and will keep your information confidential.

Find Urgent Care

If you are experiencing flu symptoms, call your doctor. If you cannot reach your doctor, use our Urgent Care Locator to get the help you need.

Find an urgent care center in your area.

Enter your ZIP code below to find nearby urgent care centers to get Tamiflu. Don’t forget to fill out our Doctor Discussion Guide to provide to your doctor.

Enter your ZIP code.

Indications

Tamiflu is a prescription medicine used to treat the flu (influenza) in people 2 weeks of age and older who have had flu symptoms for no more than 2 days. Tamiflu can also reduce the chance of getting the flu in people 1 year and older.

Tamiflu does not prevent bacterial infections that may happen with the flu.

Tamiflu is not a substitute for an annual flu vaccination.

Do not take Tamiflu if you are allergic to oseltamivir phosphate or any of the ingredients in Tamiflu.

Important Safety Information

  • If you have an allergic reaction or a severe rash with Tamiflu, stop taking it and contact your doctor right away. This may be very serious.
  • People with the flu, particularly children and adolescents, may be at an increased risk of seizure, confusion, or abnormal behavior early during their illness.
  • Let your doctor know if you are pregnant, nursing, have heart problems, breathing problems, a weakened immune system (immunocompromised), kidney problems or other medical conditions as Tamiflu may not be right for you.
  • Also tell your doctor about any medications you are taking or if you've received a nasal-spray flu vaccine in the past two weeks.
  • The most common side effects are mild to moderate nausea, vomiting, diarrhea and stomach pain.

Please see the Tamiflu full Prescription Information for complete Important Safety Information.

You are encouraged to report side effects to Genentech by calling 1-888-835-2555 or to the FDA by visiting www.fda.gov/medwatch or calling 1-800-FDA-1088.

Go to Tamiflu.com (Nonmobile Version)