Vermox tablets and suspension treatment are manufactured by pharmaceutical brand Janssen. The medication is used to primarily treat threadworm infections but can also be used to treat other common worm infections such as roundworms, hookworms and whipworms. Vermox contains the active ingredient mebendazole which belongs to the anthelmintic group of medicines. It stops the worms from absorbing essential sugars that they need in order to survive. With their sugar stores depleted the worms become weak and eventually die, at which point they are excreted from the body in faeces.