Bio Spot Active Care Flea and Tick Spray for Cats and Kittens can be used in place of a monthly topical treatment. You can also alternate between the two products. It is not recommended that you use more than one product at the same time because it could cause resistance issues.
The Etofenprox residual in the Bio Spot Active Care Flea and Tick Spray for Cats and Kittens lasts only slightly longer than the active insecticides in the Petcor Flea Spray. The IGR in the Petcor Flea Spray lasts approximately 30 days, and approximately 2.5 months for the Bio Spot. The Petcor Flea Spray can be reapplied weekly, whereas the Bio Spot can be reapplied no sooner than 30 days from the last application. When treating cats, the Bio Spot would be a better product to use. The active ingredient is specifically for cats. The active ingredients in the Petcor, while are safe for cats, can sometimes cause reactions like foaming or excessive drooling in some cats.