I don't recommend reusing needles.  First off, sterility *is* important
here.  An abscess under the skin is still an abscess.  Secondly, dull
needles hurt.  And by the time that needle has passed through the rubber
stopper and then through a ferrets skin once, it's pretty dull.  In fact,
I often switch needles after drawing up the fluids and before making the
actual injection.  I also tend to use a 22 gauge needle rather than a 20
gauge.  It's slightly smaller, but that doesn't seem to interfere with
fluid flow and does make the injection slightly less painful.
 
Dr. Ruth
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Save lives - spay or neuter your pet.
 
[Yet ANOTHER Sukie Note: another FHL member who is an RN spoke against
first injecting air into the bag since it may cause contamination; the
nurse advised that instead of trying to pull back on the syringe, instead
apply gentle pressure to the bag to fill the syringe.]
[Posted in FML issue 3356]