How long do fleas die after being treated with Barse? - briefly
Fleas usually die within 24–48 hours after a correct Barse application. A second treatment may be needed after the life cycle completes to ensure full eradication.
How long do fleas die after being treated with Barse? - in detail
Barse, a topical flea adulticide, begins killing adult fleas within minutes of contact. Most insects are immobilized and dead by the end of the fourth hour. A small fraction may survive longer, especially if the dose is insufficient or if the flea is in a protected location; complete eradication typically occurs within 24 hours.
Factors influencing the timeline:
- Dosage accuracy – correct application delivers the intended concentration to the animal’s skin, ensuring rapid absorption.
- Flea size and health – larger or robust individuals may require additional time to succumb.
- Environmental conditions – high humidity or low temperature can slow the insect’s metabolic response to the insecticide.
- Resistance level – populations with documented imidacloprid resistance may exhibit delayed mortality.
Observational guidelines:
- Inspect the pet at the 4‑hour mark; dead fleas are usually visible on the coat or bedding.
- Perform a follow‑up check at 12 hours to confirm that no live fleas remain.
- Conduct a final assessment at 24 hours to verify total elimination.
Residual activity persists for several weeks, preventing new infestations. Re‑treatment is recommended only after the full 24‑hour kill window has passed and if live fleas are still observed. Safety precautions include avoiding contact with eyes and keeping the product away from mucous membranes.