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 to be a natural insect repellent. Suitable for cats from 12 weeks of age. 95% of the flea\'s life cycle is in the home. When tackling a flea problem, in addition to treating your pet, always use a household insecticide, such as Beaphar FLEAtec Household Flea Spray or Beaphar Extra Long Lasting Household Flea Fogger for your home, use early in the season before fleas are seen.