Azithromycin
"I was a bit skeptical at first because of all of the reviews so I waited a day or so after I actually picked up the medicine to take it ... so today I took the  1 GM powder packet. For one it tasted disgusting but I felt perfectly fine after I drank all of it. Out of no where my abdominal started hurting and then I threw up and now I have explosive diarrhea. This is horrible !!!"