giardiasis
"Was prescribed 500mg three times a day for  7 days for parasite. On the 7th day I started feeling better and my stools were returning to normal. For 3 days after the end of treatment I felt soooo good, I thought I was cured... only to be sick again on day 4 after treatment. Maybe I need a longer treatment or another antibiotic. However I saw a difference after taking it. In my case the side effect were awful tast in the mouth and dark urine, but nothing is comparable to the symptoms of this evil parasite that I am dealing with since 2 years thinking I had IBS ..."