Oseltamivir is a neuraminidase inhibitor used to treat acute influenza A or B in adult and pediatric patients. Adverse reactions are usually mild. Here, we report novel side effects associated with oseltamivir. The patient was an 11-year-old girl who developed lower lip cheilitis and stomatitis, after taking oseltamivir. Her symptoms and signs resolved within 36 h of oseltamivir discontinuation. She has clinically fully recovered and has remained well.
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