As with any medication you must first talk to a rabbit savvy vet for the correct dosage for your rabbit and current situation. The information below is for reference only! The calculator will only show the dosing based on the data inputted. Talk to a rabbit savvy vet! Note: Zoetis now sells a few new product called Revolution Plus & Stronghold Plus. These new versions should not be used on rabbits as there are no efficacy, safety, pharmacokinetics, or adverse studies conducted on rabbits yet.
Selamectin is sold under the brand names of Revolution, Paradyne, Stronghold, Selehold, Xelamec, and Clearkill SMT. It's used to treat and eliminate some parasites (fleas & mites) on a rabbit. It works by "causing neuromuscular paralysis, impaired muscular contraction, and eventual death", in the parasite. When used correctly it works very well with rabbits. There is no 'offical use' for rabbits currently and it's considered an "off label" use, but rabbit savvy vets will use it when it's safe for a rabbit, like any other medication.
Revolution and Stronghold are made by Zoetis Inc. Depending on what country you are in you could have access to both brands. In many countries you may need to see a vet first for a prescription and correct dosing.
Paradyne is manufactured by the same company (Zoetis Inc.) that makes Revolution. It's made for Vethical, a part of VCA (Veterinary Centers of America), the largest chain of animal hospitals in the US and Canada (700+). It's identical to Revolution.
Clearkill SMT is manufactured by DCI (Disinfecto Chemical Industries Pvt. Ltd.) and is made for the pet market in India and surrounding countries. NOTE!! DCI also makes many products called Clearkill "Spot ON" that is extremely dangerous to rabbits!! Clearkill "Spot ON" uses fipronil. Clearkill SMT is the correct product. If this is confusing do not use it and see a rabbit savvy vet!!