A cat's flea treatment is one of the few products in the house with a hard age and weight cut-off printed on it, and it's there for a reason - too young or too light, and the same active ingredient that works safely on an adult cat is a different calculation.

This is a spot-on solution; each pipette contains 50mg of Fipronil. It's applied at two points as a spot-on, following the instructions on the pack, and it's licensed for cats and kittens over 8 weeks old and weighing over 1kg.

• Spot-on solution; each pipette contains 50mg Fipronil
• Kills fleas within 24 hours, protection lasting up to 5 weeks
• Kills ticks within 48 hours, protection lasting up to 1 week
• Also treats lice
• For cats and kittens over 8 weeks old and weighing over 1kg
• Applied as a spot-on, at two points, per the pack instructions

On age and weight. This is licensed for cats and kittens over 8 weeks old and over 1kg only, and cannot be used outside that band - a young or underweight kitten needs a vet's advice rather than this product. It's for external use only: keep it away from eyes and mouth, and don't let a freshly treated cat sleep against anyone, especially a child, until it's dried in.

Who it's for: owners of a cat over 8 weeks and 1kg who want a single spot-on covering fleas, ticks and lice, and who will apply it exactly as the pack directs.