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This is an archived Horseadvice.com Discussion. The parent article and menus are available on the navigation menu below:
HorseAdvice.com » Horse Care » Worms, Deworming, Parasite Control » Overview of Deworming » Side Effects from Dewormers »
  Discussion on Ivermectin/hives?
Author Message
Member:
pjduback

Posted on Saturday, Feb 3, 2007 - 6:59 pm:

Could this be related? I was at my barn all day
Thursday, today Saturday I arrived to see my horse pacing his stalling and scratching everywhere on anything. Once I got his blanket off he looked like bubble pack! He's covered with bumps the size of walnuts! The only thing difference since Thursday is that he was de-wormed on Thursday morning? I called my Vet and he came out and gave him a shot to help with the itching and said the bumps should go down with in 12 hours. Could this somehow be related to his de-worming? He's on a bi-monthly de-worming schedule. I asked the weekend fillin Vet that gave him the shot and he said something about dying bot/larva? I started to itch and stop listening so could you please explain? This has never happen before and I wouldn't think that bots in January in New Hampshire would be an issue, its barley been above 20 degrees for weeks.
Thanks
Moderator:
DrO

Posted on Sunday, Feb 4, 2007 - 5:39 am:

I don't understand why dying bot larvae would cause hives pjduback, most horses have a few larvae, and some many, killed every year. I think he was confusing this with something like onchocerciasis, Diseases of Horses » Skin Diseases, Wounds, and Swellings » Hair and Coat Problems / Itching / Irritated Skin » Onchocerciasis Dermatitis.

First I think the chance of a coincidence is high but if it happens again you may have an allergy to the dewormer, though I don't believe I have seen such a report before.
DrO
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