bacterial infection
"I am currently on my second day of 7 for severe diarrhea symptoms due to gastroenteritis. I have to take Flagyl 500mg for 3 times a day. I took the first dose at the ER and thought I was going to die the entire night. I had horrendous stomach pains and my diarrhea was continuing. I also got very tired. However, when I woke up this morning I noticed my severe diarrhea was gone! I was very relieved. So far my stomach feels queasy but I will take that ANY day over diarrhea and a terrible stomach ache. My only real complaint so far is the tiredness I am feeling after taking this medication. Flagyl hasn't given me a bad taste in my mouth so far, it just tastes odd if that makes sense."