sinusitis
"Terrible, terrible antibiotic. I took Z pack for my sinus infection, which usually helps but didn't this time so my doc put me on cefdinir. No problems until the 3rd day I woke up with the most terrible diarrhea I've ever had. Same the following day. It's almost 3 weeks later and I still have the diarrhea and have gone to the ER once for iv fluids to help with my dehydration. I would NOT recommend."