Parents who overuse popular paracetamol-based medicines such as Calpol could be putting their children at risk, according to a leading paediatrician.

Alastair Sutcliffe, professor of paediatrics at University College, London, said parents were wrongly using paracetamol for mild fevers.

Such overuse could lead to higher rates of asthma and ultimately could cause liver, kidney or heart damage, he claimed.

Experts also said it was possible for recommended doses to be exceeded easily, particularly when children are being looked after by several carers.

The Royal College of Paediatrics and Child Health and the Royal Pharmaceutical Society say parents should be given more information about when to use paracetamol based medicines.

Professor Sutcliffe said: "Parents are using paracetamol too permissively. They seem to fear fever as an illness per se, which it is not.

"There is evidence that the excess usage of paracetamol is associated with increased rates of asthma, increased rates of liver damage, but less widely known, kidney and heart damage."

Steve Tomlin, spokesman for the RPS said: "Children often go from one care setting to another - with their grandparents or school - and the chances of them getting extra doses might be quite high. You only need two or three days giving an extra dose or two above what is recommended and it is not such a safe drug and can start hitting the liver."

He said parents should speak to a health professional before they first start using paracetamol-based medicines.

A spokesperson for Johnson and Johnson, who manufacture Calpol. said: "Calpol has been trusted by parents for more than 45 years to provide medicines specifically developed for children. Our range of paracetamol based medicines is designed to offer relief from mild to moderate pain and fever."