Oseltamivir (Oral)

Oseltamivir (By Mouth)

Oseltamivir (oh-sel-TAM-i-vir)

Treats and helps to prevent the flu (influenza type A and type B).

Brand Name(s):

There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have ever had an allergic reaction to oseltamivir.

How to Use This Medicine:

Capsule, Liquid

  • Your doctor will tell you how much of this medicine to take and how often. Do not take more medicine or take it more often than your doctor tells you to. Do not take this medicine for any illness other than influenza A or B.  
  • It is best to start taking this medicine as soon as possible after flu symptoms start or after being exposed to the flu (within the first 2 days).  
  • You may take this medicine with or without food.  
  • Shake the oral liquid medicine before each use. Measure the medicine with a marked measuring spoon or medicine cup.  
  • Keep using this medicine for the full treatment time, even if you feel better after the first few doses. Your infection may not clear up if you stop using the medicine too soon.

If a dose is missed::

  • If you miss a dose or forget to use your medicine, use it as soon as you can. If your next regular dose is less than 2 hours away, wait until then to use the medicine and skip the missed dose.  
  • Do not use extra medicine to make up for a missed dose.

How to Store and Dispose of This Medicine:

  • Store the capsules at room temperature, away from heat, moisture, and direct light.  
  • Store the oral liquid at room temperature or in the refrigerator, away from heat and direct light. Do not freeze. Use the medicine within 10 days after you fill the prescription.  
  • Keep all medicine out of the reach of children and never share your medicine with anyone.

Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

Warnings While Using This Medicine:

  • Make sure your doctor knows if you are pregnant or breastfeeding, or if you have kidney or liver disease.  
  • This medicine is not a substitute for an annual flu shot. It also will not keep you from developing a bacterial infection that starts with flu-like symptoms.  
  • Do not give this medicine to a child under 1 year of age.

Possible Side Effects While Using This Medicine:

If you notice these less serious side effects, talk with your doctor:

  • Allergic reaction: Itching or hives, swelling in face or hands, swelling or tingling in the mouth or throat, tightness in chest, trouble breathing  
  • Aches and pains  
  • Cough, hoarseness, or sore throat  
  • Dizziness  
  • Nausea, vomiting  
  • Runny or stuffy nose  
  • Trouble sleeping


Johns Hopkins patient information

Copyright 1996-2014 Cerner Multum, Inc. Version: 16.02.
Revision date: June 21, 2011
Last revised: by Tatiana Kuznetsova, D.M.D.

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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.

The drug reference included in this section is provided by Cerner Multum, Inc., of Denver, Colorado. Armenian Medical Network receives monthly updates from Multum.