Vermox with the active ingredient Mebendazole is effective in controlling infections caused by worms. It effectively prevents the worms from absorbing sugar, leading to their eventual death. Vermox is a treatment for worm infections of the gut, such as threadworms, whipworm, roundworm and hookworm. This treatment contains the active ingredient mebendazole, a type of medicine that is known as an anthelmintic. Vermox can be used by adults and children over 2 years old.