bacterial infection
"This medicine was a life saver. It kept me home and out of the hospital on IV antibiotics, which would have been my other option for a nasty tooth abscess, which turned into Ludwig's angina.  This was the scariest infection of my life, and because Flagyl gets rid of anaerobic bacteria (sorry for the spelling) it was the ONLY medicine that would work.  (Had tried Amoxicillin and Cipro with no result). I masked the taste by putting the pill in peanut butter, and had to take it quickly as otherwise the pill would dissolve.  By this time I was only drinking fluids through a straw as my jaw wouldn't open, but I could still get the pill in and would have milk or Ensure prior to taking the pill.  This medicine may be nasty but it is GREAT at killing nasty bacteria."