Same here! Exactly two hours after I have taken it, both times when I was on it, I have severe stomach cramps and diarrhea. It goes away pretty much till the next time I take it then starts all over again. I know a lot of people sware by this stuff, but it has never worked for sinus or any other kind of infections for me as well as simple and cheap amoxicillin!

Hope you feel better soon!

Nancy