Beaphar Cat Spot On Repels Fleas provides a simple, convenient way to repel fleas quickly and effectively, with each application lasting up to four weeks. For best results, use early in the season before fleas are seen. Contains margosa, an extract of the neem tree, which is known for being a natural insect repellent. Suitable for cats from 12 weeks of age. 95% of the flea's lifecycle is in the home. When tackling a flea problem, in addition to treating your pet always use a household insecticide, such as Beaphar FLEAtec or Beaphar Extra Long Lasting Household Flea Fogger for your home.