How does this affect breeding and eating of meat? Do you have to wait to breed, will it render meat inedible?
I've used ivermectin occasionally for my rabbits and have not found it to have any effect on breeding, other than making does that were uninterested in breeding due to lack of condition, more willing to breed when they felt better.
Since it is not labelled for use in rabbits, there is no recognized withdrawal time for butchering rabbits after ivermectin use. But ivermectin is a drug with a long history of safe use in humans; it was developed originally for use in humans and was so effective at treating river blindness, among other things, that its discoverers got the Nobel Prize. The only real safety issue seems to be related to massive overdose. The amount you give a rabbit would not generally be a concern for a human to ingest, even if you ate a lot of those rabbits! However, I don't want to take any drug in any amount unless I need it, so if it was me I'd give it about a month, which admittedly would probably err on the side of major overkill.
Researchers in Sweden studied ivermectin withdrawal times in swine and cattle, and suggested withdrawal time for Ivomec in edible tissues of swine and cattle is 21 and 28 days, respectively.
Ivermectin residues in the edible tissues of swine and cattle: effect of cooking and toxicological evaluation
https://pubmed.ncbi.nlm.nih.gov/2792466/
There is more information about ivermectin in rabbits on this thread:
https://rabbittalk.com/threads/oral-ivermectin-before-kindling.35967/#post-350294
But I've never found it necessary to give my meat grow-outs ivermectin. I've only used it in adult show/brood stock (not intended eating), once for some that came home from a fair with fur mites that did not respond to natural treatments.
I agree completely with
@Preitler. I use the chem treatments only when other attempts don't work. I've never had a case of ear mites that did not respond to simple oil treatment. Just put a few drops of olive oil or mineral oil deep in each ear, massage gently, then do it again about a week later.