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Chocolate ingredient could put a stop to persistent coughs and lead to new cough medicines

Researchers have discovered that an ingredient present in chocolate could help stop persistent coughs.

According to research published online in FASEB Journal the team have discovered that theobromine, a derivative found in cocoa, is nearly a third more effective in stopping persistent coughs when compared with codeine, currently considered the best cough medicine.

Professor Peter Barnes, from Imperial College London and Royal Brompton Hospital, and one of the paper's authors, comments: "Coughing is a medical condition which affects most people at some point in their lives, and yet no effective treatment exists. While persistent coughing is not necessarily harmful it can have a major impact on quality of life, and this discovery could be a huge step forward in treating this problem."

The researchers from Imperial College London, Royal Brompton Hospital, St Bartholomew's Hospital and Chinoin Co. Ltd, Budapest, gave 10 healthy volunteers theobromine, a placebo or codeine at different times in a randomised double blind trial.

To compare the effectiveness of each they measured the levels of capsaicin in the volunteers and compared these after giving the three options. Capsaicin is used in clinical research to cause coughing, and is used as an indicator to test the effectiveness of cough medicines.

When the volunteers were given theobromine, the concentration of capsaicin required to produce a cough was around one third higher when compared with the group receiving a placebo. When the group received codeine they needed only marginally higher levels of capsaicin to produce coughing, compared with the placebo.

Theobromine works by suppressing vagus nerve activity, which is responsible for causing coughing.

The team also discovered that unlike standard cough treatments, theobromine caused no adverse effects on either the cardiovascular or central nervous systems.

Professor Maria Belvisi, from Imperial Colleg
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Contact: Tony Stephenson
at.stephenson@imperial.ac.uk
44-207-594-6712
Imperial College London
22-Nov-2004


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