I just wanted to mention that I found an over-the-counter product at my petstore called UltraCare Flea and Lice spray for rodents. It lists rabbits, GPs, and mice specifically. The active ingredients are:
Pyrethrins .06%
Piperonyl butoxide .06%
You may be able to find something similar but you may still want to check with your vet as I did. Oh, and again don't feed treated animals to your reptiles for at least two weeks. Pyrenthrins are a low intensity toxin that actually break down very quickly when exposed to air and sunlight but just to be safe it's better to wait. Please note that pyrenthrins only kill adult fleas so you will need to retreat every two weeks until the fleas are gone.
Some other notes:
Ovitrol contains pyrenthrins to kill adult fleas but also contains an ingredient called methoprene. Methoprene works on flea larva and it thought to be completely non-toxic to mammals. If you can find an over the counter with methoprene that's even better.
I am including a list of common chemicals in flea products and the max amounts considered safe for rabbits from the House Rabbit society. This may give you an idea for mice.
.15% or less of Pyrethrins
1.0% or less combined of the following:
Piperonyl butoxide
Sesamex
Piperonyl cyclonene
N-octylbicycloheptene dicarboxamide
Precor aka methoprene (good) keeps insects from maturing
Sorry for the length. I've done quite a bit of research lately to combat a bug problem I had. Seems to be under control now and I'm not seeing side effects from the spray but I will post any that I experience. I also tried ivermectin because my vet said it's safe for reptiles but I noticed I higher number of still born pups after only one treatment which was at least a month before any treated females were pregnant so I stopped using it.
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Anna
The Zoo
Corns
1.0 Snow - Cornelius
1.1 Ghost(pastel) - Gray Ghost & Pink
1.1 Amel - Parker & Scarlet
0.1 Hypo - Nikko
0.1 Anery - Missy
0.1 Hypo Motley - Cordelia aka Cordy
Boas
0.1 Columbian (BCC) - Bella
Lizards
1.0 Leopard Gecko - Leo
Rats
I have two pet rats and about 14 breeders
Cats
1.1 Siamese - Blue & Fiona
0.1 Gray DMS - Druscilla aka Dru
Plus 3 kittens
Horses
1.0 Thourghbred (Hunter/Jumper) - Morgan's Majesty aka Cody
Plus whatever animals I am fostering for the local shelter!