bacterial infection
"This drug saved my life.  I had rapidly progressing facial cellulitis and had failed therapy on another antibiotic.   Short of dying from it I would have nothing bad to say.  Medications have side effects but they all beat death or a brain abscess.   I can live with the inconvenience of sitting up a bit and some gastric distress.  It is nothing compared to head, face, and sinus pain as cellulitis marches toward your brain!"