Will Seresto collar kill existing fleas

Yes, Seresto flea collars will kill existing fleas. The active ingredients in the collar are two types of insecticides, imidacloprid and flumethrin. These two ingredients work together to kill existing fleas and ticks on contact. This means that when a flea or tick comes into contact with the collar, it will be killed by the Seresto collar’s active ingredients. In addition, they offer long-term protection against both fleas and ticks for up to 8 months, so new infestations don’t have a chance to get started.


The answer is yes. Seresto flea and tick collar kill existing fleas when they come into contact with the active ingredients of the product. The active ingredients are released over time from the collar, providing 8 months of protection against fleas and ticks. Additionally, Seresto flea and tick collars also help to prevent further infestations by killing newly acquired fleas before they can reproduce. Seresto collars have been proven to be an effective means in controlling existing fleas while also preventing new infestations.