Seresto Flea & Tick Collar

Why it is listed

Seresto is an EPA-registered Elanco collar sold for dogs and cats with labeled 8-month flea and tick control. It is the duration leader on this list and does not need a prescription. We keep the safety score lower than the oral FDA drugs because EPA spent years reviewing incident data, and Elanco itself warns buyers about counterfeits. Follow the label; do not use a dog collar on a cat SKU mix-up.

Pros & cons

Pros

• Official Elanco US page: 8 continuous months; kills and repels fleas and ticks through contact (no bite required); water-resistant with labeled caveats if the dog swims often.
• EPA registration continued after a multi-year review announced with FDA support in 2023 (Elanco investor release). Dog and cat collars, small-dog vs large-dog SKUs.
• No veterinary prescription. One application vs monthly topicals or chews.

Cons

• Safety is scored down because EPA’s 2023 review existed precisely because of incident reports (Elanco says most frequent were dermatologic at the collar site). Registration continued; that is not the same as ‘no incidents.’
• Elanco publishes a counterfeit-collar warning: buy from authorized retailers, verify lot numbers. Fake collars are a real documented problem.
• If a dog swims once a month or more, Elanco’s own footnote shortens flea control to 5 months and tick control to 7 months. Not a heartworm product.

Score breakdown