I have used both Ferret Rx and the Vet Rx.  I like them both and have used
both.  I've had good results with either.  Uses are slightly different so
I keep both around.  The Ferret Rx works well when used in a vaporizing
method.  Both can be sprinkled on bedding or under noses.  Neither is going
to hurt your ferret.
 
Terry and the S'Wonderful 17
[Posted in FML issue 2966]