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Discussion on Adverse reactions to dewormers
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Posted on Sunday, Jun 27, 1999 - 11:19 am:
Hi Dr. O,
I recently saw a chestnut horse with white dots sprinkled randomly over his body. I thought he might have been an unusual App. but someone informed me that he was a QH and the spots (approx the size of the Canadian dollar or slightly larger than a quarter) was a reaction to a de-wormer. I've also heard of a hanovarian stud who's developed a number of "cysts" on his back, again attributed to the dewormer. My question is: is this possible? It seems odd to me. I was wondering if it was coincidince that these 2 events occured close in time and so people are making a causal relation. Although, I'm not sure, I believe the med in questions was ivermectin.
thanks
Teresa
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Posted on Monday, Jun 28, 1999 - 1:27 am:
Most likely in both these cases the owner's believe the dewormer killed off parasites and this resulted in inflammatory episodes that caused the white spots and cysts. This would be very unusual and there are certainly other explanations of these changes. I have not seen these type reactions from ivermectin or any dewormer.
When we first started using ivermectin, just after the wheel was invented, there was a remarkable number of horses with transient ventral swelling and itching due to the kill off of the onchocerca larvae that had accumulated in the skin over the years. You saw a couple every week. Alive the larvae did not cause the vast majority of horses trouble. Do to the regular use you do not see these reactions any more.
DrO
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