http://www.merckmanuals.com/vet/pharmacology/anthelmintics/benzimidazoles.html ABOVE LINK IS INFO FROM MY VET FRIEND. FENBENDAZOLE FALLS INTO THIS CLASS OF MEDS. SINCE JAN 1 2015 I AM TAKING IT 2 TIMES A DAY AND BY THE WAY SOME OF THOSE CANCER MEDS WERE ORIGINAL ANTIPARASITICS BUT TAKEN OFF THE MARKET AND RENAMED SO BIG PHARMACIES CAN RAPE OUR LIVES AND WALLETS . IF YOU LOOK UP CHEMICAL COMPOSITION OF THESE MEDS THEY ARE ALMOST IDENTICAL. THE REASON I SWITCHED TO FENBEN IS ADVICE FROM AN EXPERT IN THE PARASITIC FIELD OF FARM ANIMAL CARE(FARM VET).AFTER A 2 WEEK DOSE 2 TIMES A DAY I WILL POST MY RESULTS. THANKS FOR CARING ENOUGH TO SEND ME INFO. BY THE WAY TAXOL IS USED FOR CANCER TREATMENT( IS SOME CANCERS parasites GONE WILD)MY WIFES FRIEND TOOK IT FOR Breast Cancer AND SHE IS CANCER FREE NOW.SHE STILL TAKES A MONTHLY MAINTENANCE DOSE . WE WORM OUR PETS MONTHLY TO PREVENT parasite RELATED ILNESSES BUT MODERN MEDICINE SAYS NO TO HUMANS SO WHEN YOU DO GET SICK YOU WILL GO BROKE OR DIE TRYING TO FIX WHAT COULD HAVE BEEN PREVENTED.