What should be done if flea drops did not work on a cat? - briefly
If the topical treatment fails, try an oral flea medication or a different topical formula and schedule a veterinary examination to confirm the infestation and receive a targeted treatment plan.
What should be done if flea drops did not work on a cat? - in detail
If topical flea medication does not eliminate the infestation, first verify that the product was applied correctly: dosage matched the cat’s weight, skin was dry, and the spot was not licked off within the recommended waiting period. Incorrect application is a common cause of failure.
Next, examine the label for active ingredients. Some fleas have developed resistance to specific compounds such as fipronil or imidacloprid. Switching to a formula that contains a different class—e.g., selamectin, nitenpyram, or spinosad—can overcome resistance.
If the cat has a severe or chronic infestation, consult a veterinarian promptly. Professional assessment may include:
- Microscopic examination of fleas or eggs to confirm species.
- Prescription oral medication (e.g., afoxolaner, fluralaner) that provides systemic control.
- Combination therapy, pairing a spot‑on product with an oral dose for synergistic effect.
- Assessment for underlying skin conditions that could impair absorption.
Environmental measures are essential. Treat all areas where the cat spends time:
- Vacuum carpets, upholstery, and bedding daily; discard vacuum bags or empty canisters immediately.
- Wash washable fabrics in hot water (≥ 130 °F/54 °C) and dry on high heat.
- Apply a household flea spray or fogger containing an insect growth regulator (IGR) such as pyriproxyfen or methoprene to break the life cycle.
- Treat other pets in the household with compatible products to prevent reinfestation.
Monitor the cat for adverse reactions after any new treatment. Signs such as excessive salivation, vomiting, lethargy, or skin irritation require immediate veterinary attention.
Maintain a preventive schedule. Most effective products are administered monthly; some offer quarterly dosing. Consistent use, combined with regular environmental control, prevents recurrence.