⚡ The Quick Action Plan
1. Instant Fast Knockdown (Active Fleas)
If your cat is scratching or you see live fleas right now, a Capstar (Nitenpyram) tablet begins killing adult fleas within 30–60 minutes.
2. Monthly Preventive Spot-On
Apply a monthly spot-on like Advantage (Imidacloprid) or FRONTLINE Plus (Fipronil + S-methoprene) to kill developing fleas and prevent re-infestation.
🧮 Interactive Flea Cost & Savings Calculator
Calculate exact monthly & annual costs for your household based on live UK retail prices.
🛒 Live UK Retailer Price Index
| Product & Active Ingredient | Type | Pack Size | Cheapest UK Stockist | Lowest Delivered Total (inc. VAT) | Per-Dose Cost | Action |
|---|
⚗️ Active Ingredient Strength & Mechanism Matrix
| Active Ingredient | Action Speed | How It Works | Requires Flea Bite? | Kills Eggs & Larvae? |
|---|---|---|---|---|
| Imidacloprid Advantage & Seresto |
Fast (<12 hrs) | Neonicotinoid targeting nerve receptors on contact. Fleas do not need to bite. | NO (Contact) | Indirect |
| Fipronil Frontline & FIPROtec |
24–48 hours | GABA chloride-channel blocker causing flea central nervous system hyperexcitation. | Yes / Contact | No (Unless + IGR) |
| Nitenpyram Capstar |
Ultra-Fast (30 mins) | Oral nicotinic acetylcholine receptor antagonist causing rapid adult flea knockdown. | YES | No (Adults Only) |
| (S)-methoprene Frontline Plus |
Prevents Hatching | Insect Growth Regulator (IGR) preventing eggs and larvae from maturing into adults. | NO | YES (Direct) |
⚠️ CRITICAL SAFETY WARNING FOR CAT OWNERS: PERMETHRIN TOXICITY
NEVER use dog flea treatments on cats. Many canine treatments contain Permethrin, a synthetic pyrethroid insecticide that is FATAL TO CATS.
- Cats lack the glucuronidation liver enzyme required to metabolise Permethrin.
- Exposure causes severe muscle tremors, seizures, hypothermia, and potential death within hours.
- If you suspect Permethrin exposure, bathe the cat in lukewarm water with mild dish soap immediately and seek emergency veterinary care.
- Environmental household sprays containing Permethrin (like Indorex) are safe for carpets/bedding ONLY when cats are removed from the room until surfaces are completely dry.
ℹ️ About Fleatment & Open Source Methodology
Fleatment was created by David Linacre as a free, transparent, open-source resource for UK cat owners. Unlike commercial affiliate portals, Fleatment publishes honest delivered prices (including UK VAT and standard postage fees) to help cat owners find safe, affordable care.