This is ivermectin for topical application, now available without prescription under the Small Animal Exemption Scheme. It will kill lice, mites and other parasites on small pets such as Rats, Guinea Pigs, Ferrets and Rabbits. If you have any doubt please ask your vet for advice. Box of 4 pipettes. One pipette per rat over 300g. It is recommended to treat all your rats to eradicate all mites or lice and avoid cross contamination at a later date.