Lysodren was been pretty well abandoned years ago in favor of more effective approaches which are better suited to the type of adrenal disease ferrets get (which isn't Cushings). See these vet posts and article, and certainly with a little searching you will find more: http://miamiferret.org/fhc/murray.htm http://listserv.cuny.edu/Scripts/wa.exe?A2=ind9605&L=ferret-search&P=R24306 http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0101&L=ferret-search&P=R21160 http://fhl.sonic-weasel.org/browse.php?msg=YG7815 http://fhl.sonic-weasel.org/browse.php?msg=YG3473 http://fhl.sonic-weasel.org/browse.php?msg=YG1137 http://fhl.sonic-weasel.org/browse.php?msg=YG1127 http://fhl.sonic-weasel.org/browse.php?msg=SG3059 http://fhl.sonic-weasel.org/browse.php?msg=YG11338 http://fhl.sonic-weasel.org/browse.php?msg=YG1952 http://fhl.sonic-weasel.org/browse.php?msg=YG1928 [Posted in FML issue 4363]