Proxurr Powder contains Propoxur 1% which is used to prevent fleas, ticks, lice and checks for the itching due to fleas, ticks and lice bites. Propoxur helps to prevent re-infestation of Ticks and other ectoparasites. It acts on the nervous system of the parasites as inhibitor of acetylcholinesterase, an enzyme that hydrolyzes acetylcholine (Ach).