Drug experts are warning about the dangers of ketamine - a horse tranquilliser increasingly being used as a party drug. Airedale Bradford & Leeds Primary Care Trust warn that prolonged or heavy use of the drug can cause urinary incontinence and bladder blockage as well as damage to the kidneys and urethra.

A survey of UK dance drug users found that one-third of respondents had taken ketamine and of those over a quarter reported experiencing urinary symptoms. Dr Andrew O'Shaughnessy, consultant in public health for Airedale Bradford and Leeds PCT, said: “Ketamine use is a growing problem which, if not stopped, will lead to much human misery and increasing NHS costs during the decade. We urge users to stop now.”