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What are the side effects of paracetamol?

Possible side effects of paracetamol (more commonly known as acetaminophen) range from mild to serious. Typical side effects include: nausea, headache and stomach ache. More serious side effects include: extreme fatigue, fever, difficulty urinating, yellowish skin or eyes (a condition called jaundice), discolored urine or stool, bloody stool or bloody vomit, lightheadedness, bruising and symptoms of an allergic reaction, such as rashes, swelling and difficulty breathing. Call your doctor right away if you experience any of these more serious side effects.