Flagyl® (metronidazole) is prescribed for treating a wide variety of different infections. Some of the infections Flagyl is approved to treat include but are not limited to:
Trichomoniasis (a sexually transmitted infection caused by a parasite)
Certain infections, such as amoebic dysentery or amoebic liver abscess, caused by amoeba (a certain type of parasite)
Various infections caused by anaerobic bacteria (bacteria that do not need oxygen to survive).
On occasion, healthcare providers may prescribe Flagyl for other, unapproved uses (or "off-label" uses). Flagyl is frequently used off-label to treat many other types of infections, particularly if they are caused by bacteria that are susceptible to this drug. It is also sometimes prescribed off-label to treat Crohn's disease.
(Click Flagyl Uses for a complete overview of what Flagyl is prescribed for, including specific uses for short-acting and long-acting forms of this medication and a detailed description of how this antibiotic works.)