Oseltamivir

A neuraminidase inhibitor that prevents the flu virus from spreading within the body. Most effective when started within 48 hours of the first symptoms.

Dosage by Body Weight

Dosing for treatment in children is twice daily for 5 days. Dosing for prevention is once daily.

Body Weight
Below 15 kg
Dose
30 mg
Frequency
Twice daily
Tracking Notes
Treatment course is 5 days.
Body Weight
15-23 kg
Dose
45 mg
Frequency
Twice daily
Tracking Notes
Available as a tutti-frutti flavored suspension.
Body Weight
24-40 kg
Dose
60 mg
Frequency
Twice daily
Tracking Notes
May cause nausea or vomiting; take with food.

Weight-based dosage tracking table for Oseltamivir, including body weight, dose, frequency, and tracking notes.
Body Weight	Dose	Frequency	Tracking Notes
Below 15 kg	30 mg	Twice daily	Treatment course is 5 days.
15-23 kg	45 mg	Twice daily	Available as a tutti-frutti flavored suspension.
24-40 kg	60 mg	Twice daily	May cause nausea or vomiting; take with food.

Formulation

CapsuleSuspension

Purpose

Antiviral used to treat and prevent influenza A and B (the flu).

Generic Name

Oseltamivir Phosphate

Branded Drug Names

Oseltamivir is listed as a generic drug name. Common branded medicines that may contain the same active ingredient include:

Scheduled Drug

Yes. This medicine should be supplied or used only according to applicable prescription and regulatory requirements.

Alternatives

Zanamivir Baloxavir

Safety Advice

Alcohol

CAUTION

Oseltamivir: Alcohol may worsen dizziness, nausea, dehydration, or liver strain during antiviral treatment. Avoid or limit alcohol.

Pregnancy

SAFE IF PRESCRIBED

Oseltamivir: Use during pregnancy only when prescribed; treatment may be important for maternal infection control or prevention of transmission.

Breast Feeding

SAFE IF PRESCRIBED

Oseltamivir: Breastfeeding advice depends on the infection and treatment regimen. Use only with healthcare provider guidance.

Driving

CAUTION

Oseltamivir: May cause dizziness, fatigue, sleep disturbance, or headache. Avoid driving if alertness is affected.

Liver

CAUTION

Oseltamivir: Some antivirals can affect liver function or require monitoring in hepatitis, HIV, or severe illness.

Kidney

CAUTION

Oseltamivir: Several antivirals are cleared by the kidneys and may need dose adjustment or hydration. Consult your healthcare provider.