Oseltamivir (Tamiflu) Capsule Side Effects in Pakistan

A complete guide to Oseltamivir side effects — from nausea to neuropsychiatric events in children — and when immediate medical care is necessary.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

Side Effects

Quick Answer

The most common side effects of Oseltamivir (Tamiflu) are nausea and vomiting — taking it with food helps. There is an FDA warning about rare neuropsychiatric events (hallucinations, confusion, self-harm) in children and adolescents — parents should monitor. Severe skin rash (Stevens-Johnson Syndrome — very rare) is an emergency. Generally well-tolerated short course.

Side Effects at a Glance

Common

Nausea
Vomiting
Headache
Abdominal pain
Dizziness
Fatigue

Serious — See a Doctor

Neuropsychiatric events — hallucinations, confusion, abnormal behaviour, self-harm (especially children/adolescents — FDA warning; Japan significant postmarketing data)
Hepatitis — jaundice, dark urine (rare)
Stevens-Johnson Syndrome (SJS) / Toxic Epidermal Necrolysis (TEN) — severe skin blistering (very rare — emergency)
Anaphylaxis / severe allergic reaction (rare)

When to See a Doctor Immediately

Confusion, hallucinations, or unusual behaviour — especially children (neuropsychiatric — STOP drug, seek care)
Severe skin rash, blistering, peeling (SJS — very rare — EMERGENCY)
Jaundice, dark urine, severe abdominal pain (hepatitis — rare)
Worsening respiratory distress — flu complications beyond oseltamivir scope
Severe/persistent vomiting — unable to keep medicine down

Oseltamivir (Tamiflu) Capsule Side Effects

Oseltamivir (Tamiflu) is generally well-tolerated — the 5-day short course does not cause many side effects. However, there are some important risks to be aware of, especially neuropsychiatric events in children.

Common Side Effects

Nausea — most common; taking with food helps
Vomiting — reduced when taken with food
Headache
Abdominal pain
Dizziness
Fatigue

These side effects are mild and generally short-lived. Taking with food is the most effective way to reduce GI side effects.

Uncommon Side Effects

Diarrhoea
Insomnia
Epistaxis (nosebleed)
Conjunctivitis

Serious Side Effects — Children/Adolescents Warning

Neuropsychiatric Events (FDA Warning)

Rare neuropsychiatric events have been reported in children and adolescents with oseltamivir:

Hallucinations
Confusion, delirium
Unusual behaviour
Self-harm attempts

Important note: These symptoms may also be caused by influenza (flu) — delirium is common with fever. Distinguishing whether it is due to oseltamivir or flu can be difficult. Significant postmarketing data exists from Japan.

Guidance for parents:

Do not leave children alone during treatment
Any unusual behaviour — discontinue the medicine immediately and see a doctor
Keep children away from windows and balconies

Serious Side Effects

Neuropsychiatric events — hallucinations, confusion, self-harm (children — STOP, seek care)
Hepatitis — jaundice, dark urine (rare)
Stevens-Johnson Syndrome (SJS) / TEN — severe skin blistering (very rare — EMERGENCY)
Anaphylaxis / severe allergic reaction (rare)

When to See a Doctor

Confusion, hallucinations, or unusual behaviour — especially children
Severe skin rash, blistering, peeling (SJS — very rare but emergency)
Jaundice, dark urine, severe abdominal pain (hepatitis — rare)
Worsening respiratory distress — flu complications
Severe or persistent vomiting — medicine not being absorbed

Warnings and Precautions

Do not leave children alone during flu treatment (neuropsychiatric risk)
Dose adjustment is necessary in renal impairment — otherwise side effects may increase
If taking probenecid, inform the doctor — oseltamivir levels may rise
Timing issues with LAIV (live attenuated flu nasal spray) — seek guidance from doctor

Side Effects Summary Table

Type	Side Effect	Action
Common	Nausea, vomiting	Take with food; complete the course
Common	Headache, abdominal pain	Monitor; mild analgesic acceptable
Serious	Neuropsychiatric events	IMMEDIATELY discontinue — doctor/emergency
Serious	SJS (severe rash)	EMERGENCY — 1122 or nearest hospital
Serious	Hepatitis (jaundice)	See a doctor
Rare	Anaphylaxis	EMERGENCY

Reporting Side Effects

If you notice any unexpected side effect, report it on the DRAP pharmacovigilance portal: https://www.dra.gov.pk/pharmacovigilance

The information in this guide is for educational purposes only. If you notice any side effect, contact your doctor or pharmacist.

Frequently Asked Questions

Tamiflu ke common side effects kya hain?

The most common are nausea and vomiting. Taking it with food reduces side effects. Headache and abdominal pain may also occur — generally mild and manageable during the 5-day course.

Tamiflu se bachon mein kya risk hai?

There is an FDA warning about rare neuropsychiatric events (hallucinations, confusion, unusual behaviour, self-harm attempts) in children and adolescents — significant postmarketing data exists from Japan. These symptoms may also be caused by the flu itself — therefore children should not be left alone during flu treatment.

Tamiflu nausea se kaise bachein?

Always take it with food — nausea is considerably reduced. Some queasiness may occur but is usually tolerable during the 5-day course.

Tamiflu se severe rash ho to kya karein?

Severe rash, blistering, or peeling skin (Stevens-Johnson Syndrome — SJS) is very rare but a medical emergency. Discontinue the medicine immediately and go to the emergency room.

Tamiflu ka side effect feel ho to kya karein?

Mild side effects (nausea, headache) — take with food and complete the course. Neuropsychiatric signs or severe rash — discontinue immediately and go to the emergency room.

Brand alternatives, same-class options, and other medicines used for the same conditions as Oseltamivir Capsule.

Used for the same conditions

Other medicines commonly used for cold and flu and overlapping conditions.

Cold and Flu hub →

Sources

DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.