Metronidazole
giardiasis
"I'm taking 1x400mg tablet 5 times per day to treat giardia and although my diarrhea from the diardia has stopped, I now have terrible lower back pain and have experienced bad pains in my kidneys as well. Am currently paranoid because I think it's more than guardia due to all these extra pains I'm having but the tablets have a bad reputation for flu like symptoms so I'm hoping it's just that."