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Relenza vs. Tamiflu

Are Relenza and Tamiflu the Same Thing?

Relenza (zanamivir) and Tamiflu (oscltamivir phosphate) are antiviral medications used to treat flu symptoms caused by influenza virus in patients who have had symptoms for less than 2 days. Relenza and Tamiflu may also be given to prevent influenza in people who may be exposed but do not yet have symptoms. Relenza and Tamiflu will not treat the common cold.

What Are Possible Side Effects of Relenza?

Common side effects of Relenza include:

  • dizziness, or,
  • because this medication is an inhaled powder, increased coughing after using it

Other side effects of Relenza include:

What Are Possible Side Effects of Tamiflu?

Common side effects of Tamiflu include:

  • nausea,
  • vomiting,
  • diarrhea,
  • dizziness,
  • headache,
  • nosebleed,
  • eye redness or discomfort,
  • sleep problems (insomnia), or
  • cough or other respiratory problems.
  • The flu itself or Tamiflu may rarely cause serious mental/mood changes. This may be more likely in children. Tell your doctor of any signs of unusual behavior, including confusion, agitation, or self-injury.

What Is Relenza?

Relenza (zanamivir) Inhalation Powder is an antiviral medication used to treat flu symptoms caused by influenza virus in patients who have had symptoms for less than 2 days. Relenza may also be given to prevent influenza in people who may be exposed but do not yet have symptoms. It will not treat the common cold.

What Is Tamiflu?

Tamiflu (oscltamivir phosphate) is an antiviral medication used to treat flu symptoms caused by influenza virus in patients who have had symptoms for less than 2 days. Tamiflu may also be given to prevent influenza in people who may be exposed but do not yet have symptoms. Tamiflu will not treat the common cold.

What Drugs Interact With Relenza?

Other drugs may interact with Relenza. Tell your doctor all medications and supplements you use. During pregnancy, Relenza should be used only when prescribed. It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.

What Drugs Interact With Tamiflu?

There may be other drugs that can interact with Tamiflu. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

How Should Relenza Be Taken?

The recommended dose of Relenza for treatment of influenza in adults and pediatric patients aged 7 years and older is 10 mg twice daily (approximately 12 hours apart) for 5 days.

How Should Tamiflu Be Taken?

The recommended oral dose of Tamiflu for treatment of influenza in adults and adolescents 13 years and older is 75 mg twice daily for 5 days. Pediatric dose is determined by the child's weight. Tamiflu is not indicated for treatment in pediatric patients less than 1 year of age. Treatment should begin within 2 days of onset of symptoms of influenza.

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