Doramection is a medication in the same class as ivermectin (Ivomec),
selamectin (Revolution), etc.  I do not know if it is available here in
the US.  Your 2 ferrets with the waxy buildup in the ears most likely
still have an ear mite problem.  I would suggest using the drops for
another 3 weeks (on all of your ferrets and any other pets), continue with
the frequent cleaning of the ears, and wash all of their bedding, hammocks,
etc.  Some cases may take 3-6 weeks to clear up.  Usually after 3 weeks
the mite eggs have hatched, and you have the "second batch" of ear mites
to treat.  If you still have mites after 6 weeks then it is time to change
medication for the ear mites.
 
Hang in there,
Jerry Murray, DVM
[Posted in FML issue 3406]