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  • Generic Name: (oseltamivir phosphate)
    Other Brands: N/A
  • Last Revised: 09/2016
    • What is this medication and its most common uses?

      Tamiflu is a medicine used to treat the flu in people who have had flu symptoms for no more than 2 days. Tamiflu is also used to prevent the flu. Tamiflu is available as capsules and an oral suspension (liquid).

    • What should I know when beginning and continuing on this medication?

      How does this medication work?

      Tamiflu works by stopping the flu virus from spreading in your body.

      Tamiflu does not take the place of receiving an annual flu shot. Talk to your healthcare provider about when you should receive your annual flu shot.

      What are the beneficial effects of this medication and when should I begin to have results?

      What: In clinical studies, people who received Tamiflu within 48 hours of their flu symptoms felt better up to 1.3 days faster compared with people who did not receive Tamiflu.

      When: Everyone responds differently to treatment, so try to be patient and follow your healthcare provider's instructions. It is important that you take Tamiflu exactly as your healthcare provider has prescribed, at the first appearance of your flu symptoms.

      How do I know it is working?

      You may start to notice an improvement in your flu symptoms. This is a good indicator that your medication is working.

    • What are the possible side effects of this medication?

      The following is not a full list of side effects. Side effects cannot be anticipated. If any develop or change in intensity, tell your healthcare provider as soon as possible. Only your healthcare provider can determine if it is safe for you to continue taking this medication.

      More common side effects when used for flu treatment may include: nausea, vomiting, headache.

      More common side effects when used for flu prevention may include: nausea, vomiting, headache, pain.

      Less common side effects of Tamiflu may include:

      Serious allergic reactions, with symptoms such as skin rash or hives; skin blistering or peeling; blisters or sores in your mouth; itching; trouble breathing; swelling of your face, eyes, lips, tongue, or throat; or chest pain or tightness.

      Changes in behavior (especially in children), with symptoms such as confusion, speech problems, shaky movements, seizures, hearing voices, or seeing things that are not really there.

    • Who should not take this medication?

      Do not take Tamiflu if you are allergic to it or any of its ingredients.

    • What should I tell my healthcare provider before I take the first dose of this medication?

      Tell your healthcare provider about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Tamiflu. Also, talk to your healthcare provider about your complete medical history, especially if you have kidney problems, problems swallowing capsules, or a history of fructose (fruit sugar) intolerance, or if you are pregnant, plan to become pregnant, or are breastfeeding.

    • What is the usual dosage?

      The information below is based on the dosage guidelines your healthcare provider uses. Depending on your condition and medical history, your healthcare provider may prescribe a different regimen. Do not change the dosage or stop taking your medication without your healthcare provider's approval.

      Flu Treatment

      Adults and adolescents ≥13 years: The recommended dose is 75 milligrams (mg) twice a day for 5 days.

      Children 2 weeks-12 years: Your healthcare provider will prescribe the appropriate dose for your child based on his/her weight.

      Flu Prevention

      Adults and adolescents ≥13 years: The recommended dose is 75 mg once a day for at least 10 days.

      Children 1-12 years: Your healthcare provider will prescribe the appropriate dose for your child based on his/her weight.

      If you have kidney problems, your healthcare provider may adjust your dose appropriately.

    • How should I take this medication?

      Take Tamiflu exactly as prescribed by your healthcare provider. Do not change your dose or stop taking Tamiflu without first talking to your healthcare provider.

      Take Tamiflu with or without food. There is less chance of stomach upset if you take Tamiflu with food.

      If Tamiflu oral suspension is not available or you cannot swallow Tamiflu capsules, your healthcare provider or pharmacist may instruct you to open Tamiflu capsules and mix the capsules' contents with sweetened liquids such as chocolate syrup (regular or sugar-free), corn syrup, caramel topping, or light brown sugar (dissolved in water).

      If your healthcare provider or pharmacist has instructed you to take Tamiflu oral suspension or open your Tamiflu capsules, be sure to review the instructions that came with your prescription before you start taking Tamiflu.

    • What should I avoid while taking this medication?

      Do not receive certain vaccines without first talking to your healthcare provider.

    • What are the possible food and drug interactions associated with this medication?

      No significant interactions have been reported with Tamiflu at this time. However, always tell your healthcare provider about any medicines you take, including over-the-counter medications, vitamins, and herbal supplements.

    • May I receive this medication if I am pregnant or breastfeeding?

      The effects of Tamiflu during pregnancy are unknown. Tamiflu can pass into breastmilk in small amounts. Tell your healthcare provider immediately if you are pregnant, plan to become pregnant, or are breastfeeding.

    • What should I do if I miss a dose of this medication?

      If you miss a dose of Tamiflu, take it as soon as you remember. However, if it is almost time for your next dose (within 2 hours), skip the one you missed and return to your regular dosing schedule. Do not take two doses at once.

    • How should I store this medication?


      Store Tamiflu capsules at room temperature.

      Oral Suspension:

      Store Tamiflu oral suspension in the refrigerator for up to 17 days. Tamiflu oral suspension may also be stored at room temperature for up to 10 days.

    • Who should I contact in case of emergency or overdose?
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      In the event of a medical emergency call your doctor or 9-1-1 immediately. In the event of overdose, call your doctor or poison control for further instructions.
      National Poison Control#: Call 1-800-222-1222

      This PDR+ drug information has been developed by the Physicians’ Desk Reference Network (PDRN), a source of medication information trusted by doctors for over 65 years.

      This monograph summarizes the most important information about your medication and does not cover all the information you may need. If you have any questions or concerns or want to learn more about your medication, ask your healthcare provider; he/she will be able to provide answers to your questions. This medication should only be used by the patient for whom it was prescribed and should not be shared with other people.
    • Additional patient resources.
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