Permethrin is a pesticide that is used to kill fleas on dogs, cats, and other animals. It works by attacking the nervous system of fleas, causing them to die. Permethrin does not kill adult fleas, but instead it prevents them from laying eggs, so that there are fewer adult fleas present in the home.
Permethrin is an insecticide that can be used to kill fleas, as well as ticks and lice. It’s applied topically to the skin or hair, which means that it gets absorbed into the body and works from the inside out. This makes permethrin a safer option for your pet than many other topical flea treatments because there’s no risk of accidentally poisoning yourself or others who might come into contact with your pet after treatment.
Permethrin should be used only on animals that weigh less than 10 pounds, such as cats and dogs. It isn’t safe for use on humans or other mammals, so you should never try to treat yourself or another person using this product.
Permethrin is effective against most pests including bed bugs, ticks, mites and lice but does not work on all insects such as ants or mosquitoes. When using permethrin-based products it is important to follow the directions on the label carefully so you do not expose yourself or your pets to too much of these chemicals which could cause serious side effects such as seizures or death if swallowed directly off skin contact with these chemicals when they rub off onto fingers/hands after applying product directly onto pets’ coats/fur where they may lick themselves clean afterwards (which can happen even if application instructions are followed carefully).
How Does Permethrin Kill Flea
Permethrin is the active ingredient in several products that are used to kill fleas, including [name of product]. It kills fleas by attacking the nervous system. When you apply it to your pet’s skin, it seeps into their skin and spreads over their body. The substance then enters into their blood stream and begins disrupting the nervous system, causing death by paralysis.
Flea collars and other topical treatments use permethrin for this reason—it can be absorbed through your pet’s skin and kills fleas without having to be ingested by them.
How Long Does Permethrin Take To Kill Flea?
Permethrin, a common insecticide used to treat animal skin, is also effective against fleas.
The length of time it takes to kill a flea will depend on the concentration of permethrin, as well as how long the flea has been exposed to it.
The longer a flea is exposed to permethrin, the more likely that it will be killed by the chemical. The exact amount of time it will take for a flea to die depends on the concentration of permethrin and how long it has been exposed to it.
Does Permethrin Kill Fleas and Eggs?
Permethrin is an insecticide that is highly effective in killing fleas and their eggs. It works by covering the insects’ bodies, causing them to die of dehydration.
Permethrin does not kill all flea larvae in one application, but it can prevent future generations from developing. If you are using it in your home, you should make sure to vacuum thoroughly before and after treatment, as this will help remove the dead pests and their eggs.
How Much Permethrin Do I Mix for Fleas?
The amount of permethrin you mix depends on the size of your dog and how long you want to treat them. For a small dog (less than 25 lbs), use 1 oz of permethrin cream per application. You should apply this to the base of the neck and under each front leg.
For a medium dog (25-50 lbs), use 2 oz per application. Apply this to the same areas as before, but also apply it under each hind leg as well. For a large dog (50+ lbs), use 4 oz per application. Apply this to all of the same areas as before, plus any additional areas where fleas are likely to hide or breed—such as in their ears and around their eyes.
Is Permethrin Toxic to Human and Pets
Permethrin is toxic to humans and pets, but this toxicity can be managed with proper precautions.
Permethrin is a synthetic chemical that is used as an insecticide and pesticide. It is also used to treat head lice in humans, but it was discovered that permethrin is toxic to humans and pets after it was linked to several deaths.
The symptoms of permethrin poisoning in humans include:
- -Severe skin irritation or rash
- -Severe eye irritation
- -Headache
- -Dizziness
- -Nausea
- -Vomiting
- -Diarrhea
List of Fleas Repellent and Where to Buy
Flea repellent is one of the best ways to keep fleas away from your home, though it’s not as easy as just spraying something on the carpet and waiting for it to dry. Here, we’ll discuss some of the best flea repellents on the market today and where you can buy them:

Vet’s Best Flea and Tick Home Spray | Flea Treatment for Dogs and Home | Plant-Based Formula | 32 Ounces
Price : $9.97
Features :
- GENTLE PROTECTION: Vet’s Best Flea & Tick Home Spray uses certified natural ingredients to kill fleas, flea eggs, and ticks on contact.
- PROVEN EFFECTIVE: Whether facing an active infestation or are applying for routine prevention, our spray is scientifically proven effective against pests but gentle enough to use around the whole family.
- CERTIFIED NATURAL OILS: Each steam-distilled essential oil is selected for its potent pest-fighting properties and is 100% Certified Natural.
- TOTAL HOME DEFENSE: Applies easily on surfaces, indoors and out, including dog bedding, crates, furniture, blankets, upholstery, carpets, outdoor surfaces, and more. Also gentle enough to be applied directly on dogs and puppies 12 weeks or older.
- MADE IN THE USA: Our products are proudly manufactured in the USA with quality domestic and internationally sourced ingredients.
Additional Info :
Color | Green |
Item Dimensions | |
Height | 0.81 Inches |
Width | 3.38 Inches |
Length | 3.38 Inches |
Weight | 2 Pounds |

Cutter 61067 HG-61067 32Oz Rts Bug Free Spray, 1 pack, Silver Bottle
Price : $8.98 ($0.28 / Ounce)
Features :
- KILLS FAST: Kills mosquitoes, listed ant types, fleas and other listed insects
- QUICKFLIP HOSE-END SPRAYER: Hose-end-sprayer activates spray at the flip of a switch – just grip, flip and go
- LASTS ALL SUMMER: Controls up to 12 weeks against house crickets, carpenter ants, harvester ants, lady beetles and earwigs
- COVERAGE: Treats up to 5,000 square feet of lawn
- NO MIXING REQUIRED: Attach the sprayer to a garden hose to treat your lawn, landscape and outdoor surfaces where insects hide
Additional Info :
Color | Silver Bottle |
Item Dimensions | |
Height | 11.5 Inches |
Width | 2 Inches |
Length | 5.25 Inches |
Weight | 1.08 Pounds |

FRONTLINE Plus for Cats and Kittens (1.5 pounds and over) Flea and Tick Treatment, 3 Doses
Price : $33.14
Features :
- Waterproof flea and tick treatment for cats and kittens: Frontline Plus for Cats provides waterproof, fast-acting, long-lasting flea and tick treatment and control for your cat. This product is approved for use on cats and kittens 1.5 lbs and over.
- Break the flea life cycle with frontline: Frontline flea and tick treatment for cats kills adult fleas plus flea eggs and larvae to stop existing infestations and prevent establishment of new infestations.
- Kills fleas and ticks: Frontline flea and tick treatment for cats kills fleas, flea eggs, lice, and ticks. This flea and tick treatment kills ticks, including those that may transmit Lyme disease.
- Trusted flea and tick protection for cats: Frontline Plus for Cats has been trusted by veterinarians for nearly 20 years. Made with 2 tough killing ingredients, fipronil and (S)-methoprene – one to kill adult fleas and ticks and the second to kill flea eggs and larvae – this fast-acting, long-lasting protection provides flea and tick control for cats and kittens 8 weeks and older.
- Lasting flea and tick protection: Frontline’s long-lasting formula is stored in the oil glands of the cat’s skin to give non-stop flea and tick protection for a full 30 days. Frontline flea and tick treatment for cats works non-stop for a full 30 days. A 3-dose supply lasts for 3 months.
Additional Info :
Color | Green |
Item Dimensions | |
Height | 0.5 Inches |
Width | 4.5 Inches |
Length | 6 Inches |
Weight | 0.07054792384 Pounds |

Bayer Permectrin II Insecticide, 32-Ounce
Price : $31.99
Features :
- Aids in control of cockroaches, mosquitoes and spiders in and around farm premises
- Effective against mange mites and hog lice on swine and mites on poultry
- Convenient to apply as a high or low pressure spray, with a hand or garden sprayer or as a spot spray
Additional Info :
Item Dimensions | |
Height | 8 Inches |
Width | 2 Inches |
Length | 5 Inches |
Weight | 1.95 Pounds |

Durvet Permethrin 10%, 8oz
Price : $13.19
Features :
- Rapid-kill livestock insecticide concentrate
- SAFE: Permethrin is highly toxic to insects but not to animals or humans
- APPROVED FOR USE ON: Dairy cattle, beef cattle, horses, sheep, goats, dogs, swine, poultry, livestock premises and homes
- BROAD SPECTRUM: Kills darkling beetles, bed bugs, poultry lice, fowl mites, horn flies, house flies, face flies, fleas, ticks, lice, and mange mites
- INDOOR AND OUTDOOR CONTROL: Safe to use in homes and non-food areas of poultry houses, dairies, cattle barns, milking parlors, horse barns, swine houses, warehouses, restaurants, and kennels
Additional Info :
Item Dimensions | |
Height | 6 Inches |
Width | 2 Inches |
Length | 4 Inches |
Weight | 0.5 Pounds |
In Conclusion
Permethrin can be used to treat fleas on dogs and cats, but it is not a good choice for killing fleas in your home. It is very effective at killing fleas on animals, but not as effective in killing them off of the animal and out of your home. If you want to get rid of fleas in your house, you should use a different type of chemical treatment such as pyrethrins or bifenthrin.