Get emergency medical help if you have signs of an allergic reaction to oseltamivir (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).
Some people using oseltamivir (especially children) have had sudden unusual changes in mood or behavior. It is not certain that this medicine is the exact cause of these symptoms. Even without using oseltamivir, anyone with influenza can have neurologic or behavioral symptoms. Call your doctor right away if the person using this medicine has:
sudden confusion;
tremors or shaking;
unusual behavior; or
hallucinations (hearing or seeing things that are not there).
Common oseltamivir side effects may include:
nausea, vomiting;
headache; or
pain.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Oseltamivir side effects (more detail)
