One of my GSd's was on Atopica for 3 months..I'm assuming your talking about oral atopica?????
If so, mine was on it for perianal fistula's, (blew a gland which resulted in fistulas, atopica or cyclosporine (same diff) is a widely used for this)
There can be alot of side effects with atopica, luckily the only side effect I saw, was Dodge lost his coat BIG TIME,,you think GSd's shed? While on atopica, OH MY LORDY,,a normal "shed" would have been welcome,,this was MAJOR...not bald mind you, but no coat ,,kinda like a lab coat??? it grew back fuller than ever after off the atopica..
Most recommend (and hopefully your vet would to!!!) to do a "trough" test, to regulate dosage,,if you give to much or to little, it won't be effective. Also, keep an eye on liver/kidney function...Other side effects can be just generally not being able to tolerate the medication (which can be from to high a dosage as well,) not eating, vomiting, diarhea...
On the pf list I belong to, if you see side effects it's recommended you stop usage, because it's probably not going to work.
Atopica basically is going to shut down the immune system,,so while it looks like a "cure" , it kinda isn't, its shutting down the dogs immune system, which leaves them subject to "whatever" else they can pick up..no immune system to fight it off..so it can be a catch 22.
Personally, after doing all the research I did on this drug prior to giving it to my dog for 3 months, it's not a drug I would want my dog on for an extended period of time. Many that have PF dogs and have gone this route also agree, but then again there are some that have had their dogs on it for years to keep the disease in remission. My GSD, thankfully, did not have "true" PF's, and the atopica did what it was supposed to and he has been PF free for almost 3 years.
(OH yes, it was EXPENSIVE, I believe I paid, around 15$ per 100mg pill daily.that was at vet's cost)
Diane