Re: RC: Drug testing

[Linda Flemmer <bluewolfranch@yahoo.com>]

Mary Anne,

First of all, if my horse needed antibiotics, then I
think he'd be too sick to take to a competition.  I
wouldn't worry about withdrawal times and drug
testing.

If you are asking with an eye towards how long a dose
is effectively in the body to fight the infection,
I'll refer you to Tobin, "Drugs & the Performance
Horse", 1981.
NOTE - these are not the times to non-detectable
amounts in the blood - just sub-therapeutic levels.

Drug/therapeutic blood level/approx. time to sub
therapeutic level

Penicillin/0.1-0.2 mcg/ml/12 hrs
Ampicillin/--/6-8 hrs
Gentamicin/1 mcg/ml/8 hrs
Oxytetracycline / 1-2mcg/ml/24 hrs
Chloramphenicol/5mcg/ml/6 hrs
Sulfonamides/>50 mcg/ml/12-14 hrs

I hope that these help.  I really treasure Tobin as a
resource.  If you ever see it for sale, try to pick it
up!

Linda Flemmer
Blue Wolf Ranch
Bruceton MIlls, WV


--- Mary Anne Maynard <paulm1@jps.net> wrote:
> Is there somewhere I can find out how long certain
> antibiotics stay in blood stream or the urine of the
> horse?
> Thanks in advance
> Mary Anne Maynard
> 


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