The narrow food specialization of fleas is reflected in the fact that the drugs used to destroy them less than other insects. The parasite is not able to eat the poisonous bait. Therefore it can be poisoned using such means: sprays and aerosols, the active components of which penetrate into the insect with air; preparations of contact action in the form of powders or suspensions; crayons.
Virtually all the remedies for fleas affect the nervous system of parasites. They block the transmission of impulses, which leads to paralysis and death of the insect. The active substances in the preparations can be different. Some use insecticides of the pyrethroid group, in others – organophosphorus compounds.