Pripsen mebendazole tablets contain the active ingredient mebendazole, which is a type of medicine called an anthelmintic. It is used to treat certain types of worm infections of the gut. Mebendazole works by preventing worms from being able to absorb sugars that are essential for their survival. This depletes the energy stores of the worms, leading to their eventual death within a few days. The dead worms are then excreted from the gut in the stools.