Tamiflu

Overview

What is Tamiflu?   

Tamiflu, known generically as oseltamivir, is an antiviral medication used primarily for the treatment and prevention of influenza A and B—commonly referred to as the flu. It works by inhibiting the neuraminidase enzyme, which is essential for the replication of the influenza virus within the body. The active ingredient is oseltamivir (as phosphate).  

Global Name

• Generic name: Oseltamivir
• Brand name: Tamiflu 

Usage

What is Tamiflu used for? 

Tamiflu is used to treat: 

• Treat the flu (influenza A and B) in people 2 weeks of age and older who have had flu symptoms for no more than 48 hours. 

• Prevent the flu in people 1 year of age and older. 

How do you use Tamiflu? 

Availability: 
Tamiflu is available in capsule form and as an oral suspension.

Dosage information: 

• Adults and children 13 years and older: 75 mg twice daily for 5 days for treatment, and 75 mg once daily for up to 10 days or as per the duration of community flu outbreak for prevention. 

• Children (1 year and older): Dosage based on body weight. Typically, 30-75 mg twice daily for 5 days for treatment. Best to speak to your doctor for an accurate dosage. 

Are the following suitable for getting the drug 

• Children: Suitable for children 2 weeks and older for treatment and 1 year and older for prevention. 

• Adults: Suitable for adults. 

• Elderlies: Suitable for elderly patients; dose adjustments are not typically necessary. 

Is there anyone who shouldn’t get the drug?   

• Children: Not recommended for infants under 2 weeks old. 

• Adults: Those with severe renal impairment may need dose adjustment. 

• Elderlies: Same as adults, though always consider overall health status. 

• Pregnancy: Generally considered safe but should be used under a doctor’s advice. 

• Lactation: Consult with a healthcare provider, though studies suggest low levels in breast milk. 

Allergies: Avoid if allergic to oseltamivir phosphate or any other components of the drug. 

Warnings and Precautions: 

Interactions and contraindications of Tamiflu: 

• Interacts with: Limited interaction with other drugs, but always inform the healthcare provider about all medications being taken. 

• Conditions: Use cautiously in patients with renal impairment or serious underlying health conditions. 

Side Effects

Common side effects include: 

• Nausea 

• Vomiting 

• Headache 

• Pain 
  

• Seizures 

• Sudden confusion 

• Delirium 

Pharmacist Tips

• Storage information: Store at room temperature away from light and moisture. 

• Handling instructions: For oral suspension, shake well before use and use the dosing syringe provided. 

Availability

Where is Tamiflu available in Hong Kong?

Tamiflu is a prescription medication that can be prescribed by healthcare providers. 

FAQs

When should I start taking Tamiflu for it to be effective? 

Tamiflu is most effective when started within the first 48 hours of flu symptom onset. 

Can Tamiflu cure the flu?  

Tamiflu does not cure the flu but can reduce the duration of symptoms and prevent complications. 

Is Tamiflu effective against all types of flu viruses?  

Tamiflu is effective against types A and B influenza, which are the most common types of the virus. 

Can I take Tamiflu as a preventive measure if someone in my home has the flu?