Flea

Kitten revolution (semilictin) is the first recommended for fleas , it also will also treat a broad spectrum of pests includingear mites mange mites and fur mites .

if you cant afford kitten revolution, or get a prescription,  advantage   kitten  is also rabbit safe OTC and cheaper (imidacloprid)

Excerpt: Dermatologic Diseases Laurie Hess DVMDiplomate ABVP, in Ferrets, Rabbits, and Rodents (Second Edition), 2004

Treat flea dermatitis with carbaryl-based flea powder, safe for cats, 1 to 2 times per week. Imidacloprid (Advantage, Bayer Animal Health, Agriculture Division, Shawnee Mission, KS) and the insect growth regulator, lufenuron (Program, Novartis Animal Health Canada, Mississauga, Ontario) have been used topically on rabbits to treat fleas,21,23 although neither is labeled for use in rabbits. The 10% spot-on topical formulation of imidacloprid (Advantage 40 for cats, 0.4 mL topical solution) has been used safely and effectively to treat flea infestations in rabbits.34 For rabbits older than 10 weeks of age and weighing less than 4 kg, 0.4 mL is applied to the skin at the base of the neck. Adult rabbits weighing more than 4 kg should receive 0.8 mL in the same site. The environment also must be treated with insect growth regulators and insecticidal sprays, and rabbits must be removed until the environmental products have dried. Borate powder may be used on infected rugs. Permethrin and pyrethrin-based environmental treatments may be ineffective because of flea resistance.

Reference:

. Hutchinson MJ, Jacobs DE, Bell GD, et al. Evaluation of imidacloprid for the treatment and prevention of cat flea (Ctenocephalides felis felis) infestations on rabbits. Vet Rec 2001;148: 695-696.