I’ve used it on rabbits for fleas. Not great results, I think that fleas are a bit to hard bodied for it to work well. It was amazing on chickens for lice, which are soft bodied.
For mites, which tend to be tenacious, I found I had to use stronger stuff. Pyrethrin has worked well on several species of furred animals I had. Because it breaks down easily in the digestive system it is considered relatively safe for rabbits and cats which lick their fur.
I’ve even used it on mice and rats with no ill effects.
This is pyrethrin NOT permethrin which is a synthetic and toxic version. Pyrethrin only.
It’s easily found at pet shops in various forms and concentrations for any animal from birds and hamsters, to dogs and cats.
You can also get a powder you can work into the fur.
I used the liquid version, spraying the fur and bedding, and wiping down the cage etc with it.
I also regularly wormed my rabbits (they lived outdoors at the time) with ivermectin and that also helped curb biting parasites.
You will have to apply it three times, about 5 days apart to address the mites as they go through their life cycle.
If your rabbit has free run of the house, you can also spray rugs, furniture etc with it.