Facts on 'bute', pain drug found in horsemeat

Phenylbutazone, a painkiller for horses, can cause blood disorders in humans but at doses much higher than any one person is likely to ingest from eating horsemeat.

Better known as bute, the was used in the 1950s to treat arthritis and gout in humans, but has since been withdrawn from pharmacy shelves.

"It was found to be dangerous for humans, so for decades it has only been used as a veterinary drug," said World Health Organisation food safety expert Peter Ben Embarek.

The United States' Food and Drug Administration has banned the drug's use in food-producing animals, including .

In Europe, a law requires a passport for every horse to declare whether or not it is destined for the abattoir—in which case it may not consume any on a long list of prohibited medicines that include bute.

The drug today is used a painkiller and anti- in dogs and horses that are not meant to be eaten.

It is an inexpensive and effective treatment for sore joints and to aid recovery after fractures.

Bute can be injected or fed to the horse as a powder or paste, often mixed with their feed.

Online product information for one veterinary brand of phenylbutazone granules warns of side-effects including ulcers, and internal bleeding, especially in young, ill or stressed horses.

It urged cautious use in pregnant or nursing mares as it may be toxic to the foal.

The pamphlet also urged extreme caution for people handling the drug, with as little contact as possible, and warns to "never breathe powder from crushing tablets".

In humans, phenylbutazone can induce like aplastic , which causes the bone marrow to stop producing enough red and and platelets.

People with severe forms of the disease are at risk of life-threatening infections or bleeding.

These adverse reactions were, however, associated with human use of 200 to 800 milligrams of phenylbutazone per day, according to a fact sheet issued by the Science Media Centre in London.

Broken down, bute is detectable in horse flesh, "but at concentrations considered far too low to be of concern," it added.

"Bute is known to be a carcinogen (cancer-forming) in rats, but there is no conclusive evidence for it to be carcinogenic in humans."

The centre added that about 8,000 to 10,000 horses are slaughtered for human consumption in the United Kingdom every year.

In the past five years, between two and five percent of samples taken at abattoirs have tested positive for bute in the United Kingdom.

"The idea that you might get a clinically significant amount in horse meat even after therapeutic administration to the horse is, frankly, daft," said Colin Berry, a retired University of London pathology professor.

Horsemeat is widely eaten in parts of Asia and Europe, including in France, but is considered taboo in Britain.

add to favorites email to friend print save as pdf

Related Stories

UK: Horse drug may have entered human food chain

Feb 14, 2013

(AP)—Six horse carcasses that tested positive for an equine painkiller may have entered the human food chain in France, Britain's food regulator announced Thursday—and the agency's chief said horsemeat tainted with the ...

Humans aren't the only ones with obesity problems

Apr 24, 2007

Horses are inheritably couch potatoes. An overeating, slothful horse leads to an obese horse. Unlike humans, however, horse owners often don’t see the dangers of an obese horse. Caretakers may see no harm ...

UK: Lasagna products 60 percent horsemeat (Update)

Feb 07, 2013

(AP)—Some beef lasagna products recalled from British stores contained more than 60 percent horsemeat, U.K. food safety authorities said Thursday. It was the latest revelation in a growing scandal surrounding the use of ...

Recommended for you

Cold cash just keeps washing in from ALS challenge

Aug 28, 2014

In the couple of hours it took an official from the ALS Association to return a reporter's call for comment, the group's ubiquitous "ice bucket challenge" had brought in a few million more dollars.

Medtronic spends $350M on another European deal

Aug 27, 2014

U.S. medical device maker Medtronic is building stronger ties to Europe, a couple months after announcing a $42.9 billion acquisition that involves moving its main executive offices across the Atlantic, where it can get a ...

Mind over matter for people with disabilities

Aug 26, 2014

People with serious physical disabilities are unable to do the everyday things that most of us take for granted despite having the will – and the brainpower – to do so. This is changing thanks to European ...

User comments