I use bovine [cattle] ivermectin Sub Q,[1 ml for a 6 to 8 lb rabbit, 1 1/2 ml for larger rabbits] - although i did not have a problem the few times I used it on pregnant rabbits, -, ...it is not recommended for use on pregnant rabbits. Ivermectin paste [used orally ] works for some folks, [I have not used that either]
I have not used it, -- but .. some people report that ... "Revolution" works for fur mites on rabbits . [I prefer Ivermectin as it has always worked for me, and been trouble free [no re infestations and no sick rabbits] ]
I also found this info on a website
https://www.raising-rabbits.com/fur-mit ... bbits.html
Cat or kitten flea powder should obliterate the adult fur mites in rabbits. A second dusting 10 days later is very important in order to kill newly hatched mites. The two treatments should solve the infestation, but if necessary, a third application 10-14 days after the second dusting is acceptable.
Ivermectin, topical, oral or subcutaneous is also effective. If injecting, use 1% Cattle Injectable Ivermectin, 0.018cc per pound. (That's a teensy amount.) Administer upon discovery, and then again 10-14 days later. A third dose is acceptable, given 10-14 days after the second dose.
Revolution® (Selamectin) is related to Ivermectin and can also be used. (Use Revolution on rabbits 11 pounds (5 kg) or more, and at your own risk.)
Do NOT use Frontline® or Advantage® on rabbits. The manufacturer of Frontline products strongly recommends against using it on rabbits as the side effects can be severe, including death, and Advantage is not effective against fur mites.