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I had a similar problem with my gelding except that it did not come back. I 
talked to the field services clinicians and the dermatologist at Texas A&M, and 
they told me that Hydroxazine is the best drug for horses as far as 
antihistamines go. For long term control, this is what they would recommend 
using. Also, your guy is only 2 years older than mine, and they said that 
that's right around the age that many long-term allergies start to develop. If 
it persists, I would recommend skin testing as well. 

I never got as far as skin testing, as Trigger's hives never returned. He had 
hives from nose to tail (they were even covering his tail), swollen eyelids, 
face, and sheath. he was depressed, but had a great appetite (Trigger lives to 
eat), and his temperature climbed all the way up to 104.9F before I started to 
hose him. I had field services come out that night (this was in early June), 
and they gave banamine, dexamethasone, and hydroxazine.

I was told by one of our anesthesiologists who has a horse with bad allergies 
(he's about 17 now, and he developed them at age 6) that hydroxazine is illegal 
to use in competition (she rides dressage). I am not sure of the withdrawl time 
for it, but dexamethasone does have a published withdrawl time, which I *think* 
is 72 hours, but it was two months ago that I looked at that, so I may be wrong.

I would try to get him off the dex - long term steroid use in horses has it's 
share of complications, and the hydroxazine should do you just as well with 
less risk.

kris


----- Original Message -----
From: "Linda Winkel" <lwinkel@xxxxxxxx>
To: ridecamp@xxxxxxxxxxxxx
Sent: Saturday, August 9, 2008 7:21:56 AM GMT -06:00 US/Canada Central
Subject: [RC]   Possible Hives


I suddenly keep having a problem with my gelding AJ and what appear to be 
hives. For the last several weeks he keeps breaking out all over with what 
appears to be hives I do not think it is mosquito bites. Since he is covered 
head to toe. 
The vet put him on the steroid Dex and benadryl which I gave a series of 
treatments to him and got him all cleared up then about two days later they are 
back.. of course they come back on the weekend when we need to go out and do a 
ride to try and stay in some shape.. 
We live in Florida so it is hot and humid at this time of year but he has never 
had a problem before he is 8 years old and we have not changed anything in his 
environment or food.. 
He is now on a daily 1.5 cc of dex to hopefully just keep it in his system 
enough to keep the hives away. 
How hard is the dex on his system I am concerned about him being on a steroid 
so often.. and the benadryl makes him want to just kill over.. he is very tired 
with the medicine.. 
Any thoughts would be appreciated. 
  
Linda and AJ

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