Cefdinir
"I am on day 7 of this antibiotic for a sinus infection.  While my symptoms have all but gone, I still have to keep taking it of course. I noticed a couple of days ago that I was feeling "funny" approximately 2  hours after taking the medicine.  It wasn't like that at first but now I have body aches, headache, chills...kind of reminds me of the flu. "