I have been having repeated upper respiratory infections every 2-3 months. My family doctor just gives me Z-packs, which don't seem to completely clear it up. A trip to an urgent care ended with a prescription for Cefprozil. After initially feeling a bit better, after four days now, my throat is still itchy, I continue to cough and my chest is sore. The doctors at urgent care said my lungs were clear. Tired of all this!