Vermox is an effective treatment adults and children over 2 years for intestinal worm infections caused by threadworm, roundworm, whipworm and hookworm. Vermox tablets contain the active ingredient mebendazole which is a type of medicine called anthelmintic. This basically means it’s for parasitic worms. Mebendazole kills the worms by preventing them from absorbing the sugar, this means they cannot get the energy they need and die. It takes a few days for the treatment to work, but once it does your symptoms will be eliminated. Once Vermox has killed the worms inside your gut, the dead worms and larvae come out of your body in your poo. Vermox does not kill the eggs.