Azithromycin
"I had to confirm pregnancy at the doctors, and decided to get an STD test. I'm not only pregnant, but also have chlamydia. I took 2 500mg about an hour before work. I'm a server at a fine dining restaurant, started to not feel too hot when I got there. About an hour into the shift I'm already nauseous and I get a table. By the time I've got their order in I'm in a cold sweat and experiencing a lot of stomach pain. In the 5 worst stomach pains I've ever had, and I was diagnosed with celiac when I was 20. I've had this before. So I go to the bathroom and lo and behold it was the worst kind of diarrhea. Which continued after I was sent home. I learned my lesson about not researching things before I take them."