eaphar Anti-Parasite Spot On for Golden Hamsters and Gerbils 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 Golden Hamsters and Gerbils is easy-to-use and controls parasites up to four weeks. Suitable for hamsters, gerbils, mice, rats and guinea pigs weighing 300g. For animals weighing more than 300g, use Beaphar Anti-Parasite Spot On for Rabbits, Guinea pigs, Ferrets and Rats. IMPORTANT: DO NOT USE ON RUSSIAN, ROBOROVSKI, CHINESE OR DWARF HAMSTERS, AS THEY USUALLY WEIGHT LESS THAN 50g AND 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.