People who take a certain medication have been warned against drinking this fruit juice (Image: Getty)

People taking one of Britain's most commonly prescribed painkillers have been reminded of a warning about creating a dangerous cocktail by mixing it with a popular fruit juice. It should be avoided to make sure serious side effects don't take over.

Fentanyl is a potent "opioid painkiller", as described by the NHS website , which is used for treating severe pain, for example, during or after surgical procedures or a serious injury. Medical professionals must prescribe this medication, which blocks pain signals travelling between the brain and other parts of the body, and has also been shown to calm anxiety and stress associated with pain.

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