How do flea drops for cats work on the neck? - briefly
Applied to the scruff, the liquid spreads into the cat’s skin oils, creating a protective film that kills fleas on contact and is absorbed systemically to reach parasites throughout the body. The effect persists for several weeks as the active ingredient remains active in the skin.
How do flea drops for cats work on the neck? - in detail
Flea spot‑on products are applied directly to the skin at the base of the skull. The liquid contains an insecticidal or insect growth‑regulating compound dissolved in a carrier solvent. When the drop contacts the cat’s fur, it spreads across the skin surface and quickly penetrates the epidermis.
Absorption occurs within minutes. The active molecule enters the bloodstream through the dermal capillaries and is carried by the circulatory system to the entire body. Because the neck area has a dense network of blood vessels, systemic distribution is rapid and uniform. The insecticide reaches the peripheral tissues where adult fleas and developing larvae reside, disrupting their nervous system or interfering with molting.
Key steps of the process:
- Application – a measured dose is placed on the shaved skin behind the ears; the cat’s grooming behavior spreads the liquid over a broader area.
- Dermal uptake – lipid‑soluble ingredients dissolve in the stratum corneum and pass into the dermis.
- Systemic circulation – the compound binds to plasma proteins, circulating for several days.
- Target action – fleas feeding on the cat ingest the chemical; neurotoxic agents block sodium channels, while growth regulators prevent eggs from hatching.
The formulation typically includes:
- Active ingredient – e.g., fipronil, imidacloprid, selamectin, or nitenpyram.
- Solvent – ethanol or propylene glycol to facilitate rapid spreading.
- Emollient – ensures even coating and reduces irritation.
Safety considerations:
- Use only the dose prescribed for the cat’s weight class.
- Avoid contact with eyes, mouth, or open wounds.
- Do not apply to cats with known hypersensitivity to the active substance.
- Keep the cat from bathing or swimming for at least 24 hours to allow full absorption.
Efficacy lasts from one to three weeks, depending on the specific product and its concentration. Re‑application follows the label schedule to maintain continuous protection against adult fleas and their offspring.