sinusitis
"I was prescribed a 10-day dose of this horrific medication. By day 3, I was having diarrhea at least 10 times a day. I stopped taking it on day 5 after experiencing a terrible headache and intense joint pain, neither of which could by relieved by over the counter pain killers. 

That was 3 months ago and I'm still not back to normal. I still have frequent bouts of diarrhea. My doc assures me it will go away with time and probiotics, but 3 months of diarrhea is too serious a side effect in my opinion.

Also, this medication cost me over $50. Most other antibiotics are either free or cost a lot less than this poison!"