Despite this wealth of options, providing practical and effective suggestions for flea control to clients can still be a frustrating and overwhelming experience. This article provides an overview of some of the clinically relevant features of currently available flea control agents (Table 1).
Toxicity related to pyrethrins is usually associated with applying much more of the product than directed. Overdosing can cause toxic signs in both dogs and cats. Permethrins, the synthetic insecticide, has a much greater potential for resulting in toxicity.
If you have a cat or multiple cats and would like to avoid pyrethrin/pyrethroid-based products, below are some safer, effective flea control products for cats. We didnt include any over-the-counter (OTC) medications, as many are not as effective or safe in every circumstance.

Canine/dog topical flea and tick spot-on products containing pyrethrins or pyrethroids should never be used on a cat without consulting your veterinarian. Always double- and triple-check what you are applying to, or using around, your cat.
Cat owners must be aware of flea/tick medications, collars, shampoos, etc. that are made with pyrethrin, and/or its derivatives, to prevent cases of toxicity from occurring.

Furthermore, visual representations like the one above help us fully grasp the concept of Cat Flea Control With Permethrin And Pyrethrin.
flea/tick spot-on product containing a pyrethroid chemical like permethrin (usually a product labeled for dogs and not for cats) is inappropriately applied directly on a cat, either by accident or intentionally (by a cat parent unaware of the dangers).
Pyrethrins and pyrethroids are insecticides used to control and prevent flea and tick infestations in domestic animals.Most cats are exposed to permethrin after a dog flea product is applied to the cat, or the cat comes into contact with a recently treated dog.

Permethrin is an insecticide used in some flea products for dogs and occasionally (in lower doses) in flea powders and collars for cats. Exposure to high doses of permethrin, often found in spot-on dog flea treatments, can result in serious illness in cats and even death.