No, you need to use Frontline or something similar. Fleas lay eggs in your house too, so bedding must be treated with a spray for fleas, as well as any soft furnishings and carpets. Fleas are a d**n nightmare if you have an infestation, been there! You can also buy "foggers" that when set off send a "fog" of poison throughout the room it's in. Please note, though, you and all animals and plants and fish must NOT be in the room when you do it, and for a while afterwards. Also, cover all electronics like tv, stereo etc with sheets before doing using a fogger. The best thing is to use the flea drops before you end up in that situation!