When do Barss flea treatment for cats start working? - briefly
Barss flea treatment starts killing fleas within 4–6 hours after application, and most cats show a noticeable reduction in flea activity by the 24‑hour mark.
When do Barss flea treatment for cats start working? - in detail
Barss flea medication for felines begins to act within a short period after application. The active ingredient, fipronil, spreads across the skin surface through the natural oil layer and enters the bloodstream, targeting adult fleas, larvae and eggs.
- Topical formulation: Effects on adult fleas appear within 4–6 hours; a noticeable reduction in flea activity is usually evident after 12 hours. Full efficacy against the entire life cycle is achieved by 24 hours.
- Oral tablets: Flea killing starts approximately 2 hours after ingestion, with most adult fleas eliminated within 6 hours. Egg production is suppressed within 12 hours, and the treatment interrupts the life cycle by day 2.
Factors influencing speed of action include the cat’s body weight, fur length, and environmental flea load. Applying the product to a clean, dry area of the skin ensures optimal absorption. Re‑treatment is recommended every 30 days to maintain continuous protection.
Owners should monitor the cat for any signs of irritation and verify flea reduction by inspecting the coat and bedding. If fleas persist beyond the expected window, a veterinary assessment is advised to rule out resistance or improper application.