Relenza

(zanamivir)

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Prevents and reduces the symptoms of the flu.

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Our bottom line

Relenza (zanamivir) can reduce flu symptoms for people 7 years & older, but they should take it within two days of the flu starting or it won't work.

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    $63.95
Quick facts about Relenza
  • Drug class: infection
  • Rx status: Prescription only
  • Generic status: No lower cost generic available

Upsides

  • Relenza (zanamivir) is a great choice for people you don't like swallowing pills.
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What to expect from Relenza, on one page

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Downsides

  • Start Relenza (zanamivir) within 2 days of getting the flu or else the medicine won't work.
  • Taking Relenza (zanamivir) won't stop you from being contagious.
  • Relenza (zanamivir) is inhaled so people with breathing problems shouldn't take it.
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What to expect from Relenza, on one page

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How it works

Relenza (zanamivir) is an antiviral medication that stops the flu from making copies of itself.

Quick facts about Relenza
  • Drug class: infection
  • Rx status: Prescription only
  • Generic status: No lower cost generic available

Used for

  • Flu prevention
  • Flu treatment

Dosage forms

  • Inhaler
Tried Relenza? Write a review!

Prices and coupons

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What to expect when you take Relenza (zanamivir) for Flu

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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
  • Headaches
  • Diarrhea
  • Nausea
  • Nasal symptoms
  • Cough
  • Sore throat
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Side effect rates for Relenza (zanamivir)

From 2652 clinical trials of Relenza when taken for reduce flu symptoms (10 mg bid inhaled)
  • Diarrhea
    3%3%
    4%4%
  • Nausea
    3%3%
    3%3%
  • Sinus infection
    3%3%
    2%2%
  • Headaches
    2%2%
    3%3%
  • Nasal symptoms
    2%2%
    3%3%
  • Bronchitis
    2%2%
    3%3%
  • Cough
    2%2%
    3%3%
  • Sore throat
    2%2%
    2%2%
  • Dizziness
    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 Relenza.

Relenza (zanamivir)
Placebo

People taking Relenza felt side effect more

People taking Relenza felt side effect less

No difference

Risks and Warnings for Relenza (zanamivir)

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    • Higher risk if:
    • Had nasal flu vaccine within last two weeks

    Relenza (zanamivir) should not be taken if the patient has had a nasal flu vaccine within the last two weeks.