I have been having worms for more than a year now. They are small white worms and I can find them in my feces. I had taken Albendazole as a single doze and followed it with  Mebendazole for 3 days 2 doses a day. The worms disappeared for about two months but returned. I repeated the medication and another two months went by but they keep coming back. What should I do? Is it true that you can't completely cure worm infestation? Thank You for your time.