Milprazon is a broad spectrum wormer for cats, are safe to use and effective against the major worms.Milprazon contains as active substances praziquantel and milbemycin. Milbemycin is active against roundworms, hookworms, whipworms and can also be used to prevent heartworms. Heartworm infections are common in southern and eastern Europe and are transmitted by mosquitoes infected with larvae. Praziquantel is effective in infection with tapeworms, including the fox tapeworm.