A widely used anti-flu medication should be reviewed by ministers, scientists said after new research questioned the efficacy of the drug.
Tamiflu, which is used to prevent and treat influenza, shortens flu symptoms by between a day and half a day, the study suggested.
However, the authors said there is "no good evidence" to support claims the drug reduces flu-related hospital admissions or the complications of influenza.
Taking the drug could increase a person's risk of nausea and vomiting, researchers from The Cochrane Collaboration and the British Medical Journal also claimed.
And when used as a preventative treatment it can stop people developing flu symptoms but may not prevent them from spreading flu to others, the authors said.
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