Seresto Cat Collar contains Flumethrin and Imidacloprid and is used for:

For the treatment and prevention of flea (Ctenocephalides felis) infestation for 7 to 8 months.
Protects the animal’s immediate surroundings against flea larvae development for 10 weeks.
The product can be used as part of a treatment strategy for the control of Flea Allergy Dermatitis (FAD), where this has been previously diagnosed by a veterinary surgeon.
The product has persistent acaricidal (killing) efficacy (Ixodes ricinus, Rhipicephalus turanicus) and repellent (anti-feeding) efficacy against tick infestations (Ixodes ricinus) for 8 months. It is effective against larvae, nymphs and adult ticks.
Ticks already on the cat prior to treatment may not be killed within 48 hours after collar application and may remain attached and visible. Therefore removal of ticks already on the cat at the time of application is recommended. If you are unsure how to safely remove ticks from your animal, seek professional guidance. The prevention of infestations with new ticks starts within two days after application of the collar.

Do not treat kittens less than 10 weeks of age.

For more information on contraindications, warnings and active ingredients, click the following link: https://www.noahcompendium.co.uk/?id=-472678

Seresto Cat Collar