Tamiflu is an antiviral medication used to treat or prevent the flu caused by influenza A and B viruses. This includes specific strains such as the H1N1 or H3N2 viruses, which are common causes of seasonal outbreaks.
The active ingredient in this medication is oseltamivir phosphate, which works by stopping the flu virus from multiplying in the body. It is available by prescription and is most effective when taken shortly after flu symptoms appear.
Tamiflu is available in US pharmacies as oral capsules in 30 mg, 45 mg, and 75 mg strengths. It can be administered to adults and children over 1 year of age under professional medical supervision.
What it is used for
Tamiflu is indicated for the following uses:
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The treatment of the flu caused by influenza A and B viruses (including H1N1 and H3N2) in adults and children older than 1 year.
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The prevention of the flu in individuals who have been in close contact with someone already infected with the influenza A or B virus.
You should only use Tamiflu if it has been prescribed by a healthcare provider, and you must follow the specific dosage and duration they recommend.
It is important to remember that Tamiflu is not a replacement for the annual flu vaccine.
Is tamiflu an antibiotic?
Tamiflu is not an antibiotic because it does not have any effect on bacteria.
This medication is an antiviral drug specifically designed to target and act against influenza A and B viruses.
How to take it
Tamiflu should be taken by mouth with a glass of water, either with or without food. However, taking the capsule with a light meal or snack is recommended to help reduce the chance of stomach upset.
The specific instructions for use depend on the reason for the prescription:
1. Flu treatment
Treatment with Tamiflu should begin as soon as possible, ideally within the first or second day of feeling flu symptoms.
The standard recommended dosages are:
For flu treatment, the course usually lasts for 5 days. It is critical to start the medication within 48 hours of your first symptoms for the best results.
If you miss a dose, take it as soon as you remember. If your next dose is due in less than 2 hours, skip the missed dose and resume your regular schedule. Never take two doses at once to make up for a missed one.
2. Flu prevention
To prevent the flu after being exposed to someone with the virus, Tamiflu should be started within two days of the contact.
The standard recommended dosages are:
When used for prevention, Tamiflu is typically taken for 10 days, or as directed by your doctor.
Possible side effects
Common side effects of Tamiflu include headache, nausea, vomiting, or general body aches. These usually occur within the first two days of treatment and often improve after a day or two.
In children, parents should watch for sudden changes in mood or behavior. Contact a pediatrician immediately if you notice confusion, tremors, hallucinations, or any unusual behavior.
Tamiflu can occasionally cause severe allergic reactions. Seek emergency medical care immediately if you experience difficulty breathing, a closing sensation in the throat, chest pain, or swelling of the face, lips, or tongue.
Who should not take it
Tamiflu should not be used by infants under 1 year of age, or by individuals with a known allergy to oseltamivir phosphate or any other ingredients in the medication.
Consult your doctor before use if you are pregnant, breastfeeding, or have a history of kidney or liver disease, as dosage adjustments or alternative treatments may be necessary.