There are many, many bed bug sprays in the market today and many of them do not have the effect that the manufacturers of the sprays claim they have. Yes,the sprays are insecticides and they are manufactured to kill and eliminate these parasites but what most of us do not know is that these bedbugs have developed some resistance to the pesticides and insecticides and so the ones which have been used for a long time now no longer work. You should choose a spray which has been developed recently and will do a good job in eliminating these parasites.