Beaphar Cat Spot On Repels Fleas. Beaphar Cat Spot-On Repels Fleas contains margosa, a herb extracted from the Neem tree, which acts as a natural deterrent for fleas. Each pipette provides up to 4 weeks repellency from fleas. Beaphar Cat Spot-On should be used as part of an effective flea control programme. Fleas will often infest your pet's basket, bedding and regular resting areas, including carpets and soft furnishing. It is recommended that these areas should be treated with a suitable household insecticide such as Beaphar FLEAtec Household Spray and vacuumed regularly.