This particular side effect (severe shed) has not been reported.  I wonder
if this may be the result of loss of infected hair shafts (but this would
be idle musing only.) However the high margin of safety and the fact that
this drug has no apparent significant interaction with other drugs makes
it a very viable option for treatment in ferrets.  As opposed to more
traditional drugs, such as griseofulvin, which has absorption problems,
needs daily dosing for up to 6 weeks, and is teratogenic, Program seems
like a much more efficient and effective drug for treatment of ringworm
in ferrets.
 
With kindest regards,
Bruce H. Williams, DVM, DACVP
 
Join the Ferret Health List at
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[This post was followed by an abstract form JAVMA]
[Posted in FML issue 3371]