Legally run horses in Albuquerque, New Mexico, take a turn and head for home.

Long-term Clenbuterol use in horses studied

“Our study shows that after about two weeks of use, it quits working and actually makes the horses breathe a little bit worse,” Nolen-Walston explained. “The clinical significance is that clenbuterol should be used for no more than 14 days consecutively without a break. In humans, the loss of effectiveness can also be prevented by co-administration of corticosteroids, but this has not been investigated in horses.”

This quote is part of an article by Natalie DeFee Mendik, MA published by The Horse magazine online.

We have spent a lot of time talking with you about two drugs: dermorphin, made from frog secretions said to be 40 times more powerful than morphine, used to kill pain; and the anti-bleeder Lasix, the brand name for furosemide, or Salix for use on animals.

Clenbuterol is not to be confused with phenylbutazone the pain killing drug widely used on equines of all sorts and commonly referred to as “bute”. “Clen” is a powerful bronchodilator that helps relax the airways but is also considered a performance-enhancing steroid, depending on whom you ask.

Racehorses are given this drug every day of their racing lives states the article, and comes with some unsettling news from researchers.

Mendik writes:

. . . a team of researchers at University of Pennsylvania School of Veterinary Medicine’s (PennVet) New Bolton Center carried out a study on the topic and found that while clenbuterol initially reduces airway sensitivity to inhaled histamines, long-term use can result in reduced bronchoprotective effectiveness.

“Many horses, especially race horses, receive clenbuterol every day,” explained Rose Nolen-Walston, DVM, assistant professor in the Department of Clinical Sciences at PennVet.

This alarming observation is made:

“Our study shows that after about two weeks of use, it quits working and actually makes the horses breathe a little bit worse,” Nolen-Walston explained. “The clinical significance is that clenbuterol should be used for no more than 14 days consecutively without a break. In humans, the loss of effectiveness can also be prevented by co-administration of corticosteroids, but this has not been investigated in horses.”

No study has been conducted on the effect on horses from prolonged use.

Read full article >>


4 thoughts on “Long-term Clenbuterol use in horses studied”

  1. It is all heinous wherever you go; I for one am grateful for every good horse keeper everywhere. We need them. As for the others; too much money with too much power. For the moment.

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    1. really don’t agree with your comment “America….the horse’s worst nightmare.” We have MANY issues going against the horse, but damn if it isn’t worse in some other countries. Here, we can fight for the horse. Money isn’t the evil one, it’s greed and that sin belongs to humans everywhere.!

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      1. Sorry buckinhard.

        I hear you and agree.

        The comment was really just in light of the fact that it doesn’t have to be this way here and could be so much better. It wasn’t meant as a comparison to other places where things can be far worse, My apologies that it was taken that way.

        As you say we need to keep fighting for them since the crimes against them continue despite our best efforts..

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