sinusitis
"I took Z Pack for full pack and still had upper respitory infection so my Dr prescribed this. I took it for 2 days and then started severe diarrhea and after taking it for 5 days I had to call 911 to get to the hospital. I was so dehydrated with diarrhea and nausea so bad I had to be hospitalized for six days! I see I'm not the only one that had these side effects."