Im not a doctor, Im not 100% about everything. Im only a little experienced if at all. All of these treatments are costly. And contain the same active ingredient. Permethrin. You can buy an 8 oz bottle of Permethrin at a farm supply store/coop/tractor supply for 6 bucks. Or Bronco gold spray. (same stuff) Anyways mix the permethrin with water and viola. You have a much cheaper bottle of Provent a Mite. And a lot more of it.