You may as well try your local pet pharmacy. (Or farm pharmacy) Talk to the pharmacist and see if he or she will do it for you. I don't think iver is Rx only for pets.
It worked immediately -- that is, it cleared up a lot of stuff over night. Then I used it again 3 nights later and more cleared up. Now it's just clearing on its own. I'll use more in another couple of nights. I am being very conservative. But it is making visible changes.
As long as you're pretty sure it's demodex this will work. Not all rosacea is demodex, but a lot of it is.