Tamiflu

(oseltamivir)

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Treats and prevents the flu.

Skip Upsides & Downsides section. Skip to side effects section.

Our bottom line

Tamiflu (oseltamivir) is effective at treating the flu virus, but can cause stomach side effects like nausea, vomiting, and diarrhea.

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  • Price before coupon
    $135.66
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    $47.72
    65% savings
Quick facts about Tamiflu
  • Drug class: Infection
  • Rx status: Prescription only
  • Generic status: Lower-cost generic available (oseltamivir)

Upsides

  • On average, Tamiflu (oseltamivir) reduces symptoms of the flu by 1.3 days.
  • The pill form is available as a generic.
  • The brand is available in 2 different forms: capsule and liquid.
  • Can be used for treatment in children 2 weeks of age and older.
  • Tamiflu (oseltamivir) is taken for a short period of time to treat the flu: twice a day for 5 days.
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What to expect from Tamiflu, on one page

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Downsides

  • Tamiflu (oseltamivir) is not a substitute for the annual flu shot.
  • Not recommended for people with kidney problems.
  • Must be taken within 2 days of contact with an infected person, or signs of flu symptoms for Tamiflu (oseltamivir) to be effective.
  • If you have HIV, you need to be on antiviral treatment at the same time as Tamiflu (oseltamivir) to decrease the chances of drug resistance by the HIV virus.
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What to expect from Tamiflu, on one page

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How it works

Tamiflu (oseltamivir) is an antiviral that prevents the flu virus from multiplying by stopping it from being released in your body.

Quick facts about Tamiflu
  • Drug class: Infection
  • Rx status: Prescription only
  • Generic status: Lower-cost generic available (oseltamivir)

Used for

  • Flu virus types A and B
  • Flu virus types A and B prevention
  • Bird flu

Dosage forms

  • Pill
  • Liquid
Tried Tamiflu? Write a review!

Prices and coupons

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What to expect when you take Tamiflu (oseltamivir) for Flu treatment

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  • First few hoursHours
    First few daysDays
    First few weeksWeeks
    First few monthsMonths
  • Effectiveness
  • Starts to kick in
    Full effects
  • First few hoursHours
    First few daysDays
    First few weeksWeeks
    First few monthsMonths
  • Possible side effects
  • Nausea
  • Vomiting
  • Headache
  • Pain
  • Skin and allergic reaction
  • Abnormal behaviors and thoughts
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Side effect rates for Tamiflu (oseltamivir)

From 3529 clinical trials of Tamiflu when taken for flu prevention (75 mg qd)
  • Headache
    17%17%
    16%16%
  • Nausea
    8%8%
    4%4%
  • Pain
    4%4%
    3%3%
  • Vomiting
    2%2%
    1%1%
0%
10%
20%
30%
40%
50%
60%
70%
80%
Where we got our data »

The placebo bar shows how common a side effect was for people taking a sugar pill instead of Tamiflu.

Tamiflu (oseltamivir)
Placebo

People taking Tamiflu felt side effect more

People taking Tamiflu felt side effect less

No difference

Risks and Warnings for Tamiflu (oseltamivir)

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    • Higher risk if:
    • Children

    People with the flu can have nervous system, and behavior problems that can lead to death. The chance of this may be higher in children. Call your doctor right away if you have change in thinking clearly, change in the way you act, speech problems, shakiness, seizures, or hallucinations.

Pharmacist Q&A

Tamiflu (oseltamivir) questions for

Frequently Asked Questions

This medication treats acute, uncomplicated flu in individuals 2 weeks of age or older who have shown symptoms for no more than 2 days. This medication also prevents the flu for individuals 1 year or older.

Who is this drug for?

This medication treats acute, uncomplicated flu in individuals 2 weeks of age or older who have shown symptoms for no more than 2 days. This medication also prevents the flu for individuals 1 year or older.

Common concerns from people taking Tamiflu (oseltamivir)

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Food
  • Take with or without food. Take with food if it causes an upset stomach.
Kidneys and liver
  • Not recommended for people with kidney problems.
Sleep
  • People with the flu can have nervous system, and behavior problems that can lead to death. The chance of this may be higher in children. Call your doctor right away if you have change in thinking clearly, change in the way you act, speech problems, shakiness, seizures, or hallucinations.