I have a friend who went into complete remission with Flagyl. It didn't help me one iota though. However, when I had to be placed on an antibiotic while I suffered with UP, the GI doctor always had me take Flagyl along with it. I usually had to take Cipro and Flagyl when I had an infection of any sort. My doctor explained that the Flagyl kept the good bacteria from being destroyed.
After my operation, I developed an abscess inside the anus which my surgeon had to drain. He placed me on Cipro. Three days later, I could barely get out of bed! It affected all my joints. Now I can't take the stuff!
At the moment, I have a gum abscess and tomorrow have a dental appointment for the tooth to be removed (actually a cap). My dentist has me on Clindomycin.