How quickly do fleas die after treatment?
That depends on the product – take a look at the product packaging or leaflet for specific details. FRONTLINE PLUS® and FRONTLINE® SPOT ON kill fleas within 24 hours of them arriving on the pet, while FRONTLINE TRI-ACT® kills fleas within 6 hours of them jumping on a dog. There are a couple of key things to remember, whichever treatment you’ve used.
Flea products never kill fleas instantly
The flea has to come into contact with the ingredient, absorb it and then start to feel the effects. It’s a little like catching a cold – time elapses between us having contact with a cold virus and then becoming ill.