intraabdominal infection
"I took this for 12 days after developing an abdominal infection after emergency bowel surgery. It  was IV while in the hospital for 5 days and then orally 400mg 3 times a day. I don't know if it was responsible for the way I felt whilst in it (was also on co-amoxyclav)  but I felt horrendous. I had the most awful dizzy, light-hearted headed, spaced out sensations for the entire time. I had a couple of times where I felt so bad I thought I was about to die. I have never experienced anything like that before but I thought I was having a major stroke. The sensation in my head and body was how I imagine a stroke would feel. I then, as a result, had my BP shoot up to 180/110 and pulse go above 100. Really terrifying! Got rid of infection though."