Oseltamivir (Oral Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

• Phlegm-producing cough
• Wheezing

• Abdominal or stomach cramps or tenderness
• Arm, back, or jaw pain
• Bloating
• Chest pain or discomfort
• Chest tightness or heaviness
• Diarrhea, watery and severe, which may also be bloody
• Drooling
• Facial swelling
• Fast or irregular heartbeat
• Fever
• Hoarseness
• Humerus fracture (broken forearm)
• Increased thirst
• Pain
• Shortness of breath
• Tender glands of the jaw and throat
• Unusual tiredness or weakness
• Unusual weight loss

• Blistering, peeling, or loosening of the skin
• Chills
• Convulsions (seizures)
• Dark urine
• Difficulty with swallowing
• Fainting
• Fast, slow, or irregular heartbeat
• General tiredness and weakness
• Hives or welts
• Itching
• Itching, puffiness, or swelling of the eyelids or around the eyes, face, lips, or tongue
• Joint or muscle pain
• Light-colored stools
• Loss of bladder control
• Loss of consciousness
• Muscle spasm or jerking of all extremities
• Red skin
• Red skin lesions, often with a purple center
• Red, irritated eyes
• Shortness of breath
• Skin rash
• Skin rash or itching over the entire body
• Sore throat
• Sores, ulcers, or white spots in the mouth or on the lips
• Sudden loss of consciousness
• Sweating
• Swelling of the face or tongue
• Upper right abdominal or stomach pain
• Weakness
• Yellow eyes and skin

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Diarrhea
• Nausea
• Vomiting

• Abdominal or stomach pain
• Bloody nose or unexplained nosebleeds (occurs mainly in children)
• Burning, dry, or itching eyes (mainly in children)
• Cough
• Dizziness
• Ear disorder (occurs mainly in children)
• Excessive tearing of the eyes (mainly in children)
• Headache
• Redness, pain, or swelling of the eye or eyelid (mainly in children)
• Trouble with sleeping

• Pale skin
• Sneezing
• Troubled breathing
• Troubled breathing with exertion
• Unusual bleeding or bruising

• Blistering, crusting, irritation, itching, or reddening of the skin
• Blurred vision
• Cracked, dry, or scaly skin
• Dry mouth
• Flushed, dry skin
• Fruit-like breath odor
• Increased hunger
• Increased urination
• Mood or mental changes
• Skin rash that is encrusted, scaly, and oozing
• Stomachache
• Unexplained weight loss

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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