Beaphar Anti-Parasite Spot On for Rabbits, Guinea pigs, Ferrets and Rats is an effective, veterinary strength medicine containing ivermectin to treat lice, fleas, mange mites, other mites and roundworms in small animals. Beaphar Anti-Parasite Spot On for Rabbits, Guinea pigs, Ferrets and Rats is easy-to-use and controls parasites for up to four weeks. Suitable for rabbits, guinea pigs, ferrets and rats weighing more than 300g. For animals weighing less than 300g, use Beaphar Anti-Parasite Spot On for Golden Hamsters and Gerbils. IMPORTANT: DO NOT USE ON ANIMALS WEIGHING LESS THAN 300g AS THIS COULD RESULT IN OVERDOSING. We recommend treating all the animals in the cage or hutch at the same time, and treating the environment with a suitable insecticide.