Urticaria type rash triggered by wormer?

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Halfstep

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Anyone had this happen? Healthy, fit mare wormed with Equimax, suddenly came out in a terrible rash all over the body, fluidy lumps everwhere, concentrated on belly and flanks. Looks truly awful. The only thing different in her daily routine was the wormer. The other horse in the field is fine, so doubtful that it is something in the grass.......Ideas?
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I had this with a horse once, vet said not to worry, would just go...and they did, vet said something to do with migrating worm larvae & high burden???
 
any thing can have an allergic reaction to just about anything!

maybe just once, maybe every time, it could be that a conbination of the wormer with her season timing or her diet or the weather etc take a pick or it could be any of those or a hundred others with nothing to do with the wormer at all!

sorry to say it but unless you get the same reaction repeated with the same senario you can't say what caused it.
it might be worth using a different drug based wormer next time just in case, good luck let us know how it all goes bye.
 
mine can get rash from something in field?????????? and it works it way round horse, very wierd but it gone within one day
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So keep a watching brief and if not going quickly, i would want to speak to vets BUT there not alot they can't do if they haven't go a clue what causes rash. So all they can do is treat rash with steriod injection
 
Well rash is gone, but the owner is convinced it was caused by the wormer. The horse did have a fly bite on her flank - perhaps this is more likely to cause the rash? Really strange!
 
i think mine gets them from something in hedgerow, flies, something in grass, mushroom spores??????, but to be honest you'll never find out asvery difficult to find out, but glad to read gg ok now
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Ivermectin can make horses skin photosensitive for a few days after being wormed - we had a school pony that developed a rash all over her back following worming. Vet gave her some painkillers and we covered her to prevent the sun from getting to her skin. She was very stroppy for a few days but the swellings went down and she recovered well within a week.

Interestingly she had been wormed with Ivomec 8 weeks earlier with no adverse reaction, and it never happened again.
 

I did hear of a spate of cases a bit like this with imported russian horses.The wormers they had in Russia were not very effective.When they were wormed over here with modern anthelmintics,the horses had massive reactions and problems with worms migrating under the skin dying off. Unless the horse had a high worm burden and had not been wormed for a long time this is rather unlikely however.
 
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