8] Cross sensitivity was found between oxyphenbutazone and phenylbutazone
in 3 cases, but not among various sulphonamides.
Dame Sally added: "In patients who have been taking phenylbutazone
as a medicine, there can be serious side effects but these are rare.
Horsemeat containing phenylbutazone
presents a very low risk to human health.
is an anti-inflammatory treatment for horses which is potentially harmful to humans and by law is supposed to be kept off of plates.
is a veterinary medicinal product whose use in food producing animals, including horses, is illegal.
From being a straightforward case of mislabeling or fraud, the scandal took a more ominous turn last week when the UK's Food Standards Agency said phenylbutazone
, a drug potentially harmful to human health, was identified in carcasses of horses, some of which were exported to France.
In a bid to end the spiralling scandal, the tests will also look into any existence of phenylbutazone
, an anti-inflammatory drug for horses and harmful to humans.
Another 4,000 tests will be conducted on horse meat to check forthe drug phenylbutazone
- an anti-inflammatory used to treat animals but considered unfit for human consumption.
In particular, there are concerns that the horses may have been treated with the veterinary drug phenylbutazone
, which is banned from use in humans and foodproducing animals - although even this would lead to "a very low risk indeed that it would cause any harm to health," according to the Chief Medical Officer, Dame Sally Davies.
However, if the horses have illegally got into the food chain, they may contain the veterinary drug phenylbutazone
, or 'bute'.
There are fears that horsemeat may contain phenylbutazone
or "bute" - which is dangerous when used by humans.
Health Minister Anna Soubry confirmed a horse contaminated with the carcinogenic drug phenylbutazone
, known as "bute", had entered the food chain.