I went to the doctor and he prescribed the same drug for me. I was suppose to be on it for 3 days(2 tablets a day). I puked all night long on the 2nd day after taking the 3rd pill. Needless to say I quit taking it. I think it was too much die off at once for me. Just by seeing what is in my stools, I think it was die off. The drug is suppose to kill them off slowly(96% cure rate) but I know mine are still pretty strong and I'd be shocked if it killed them all.