Bob Martin Spot On Flea Control for Cats has been specially developed to repel fleas and ticks quickly and effectively. o Contains six 4 week treatments, giving 24 weeks flea protection; o Suitable for kittens from 12 weeks of age; o Clinically proven formula. If your pet has an existing heavy flea infestation, it may be necessary to treat your cat with a suitable insecticide in order to kill the existing fleas. Fleas are often found within your cat's basket, bedding, and regular resting areas, including carpets and soft furnishings; these should be treated with a suitable household flea spray and vacuumed regularly.