Amoxicillin / clavulanate
"Had increased heart rate and shortness of breath just after a few hours of taking it followed by severe nausea and vomiting over night. The next day felt extremely week and tired with light nausea and no appetite. My stomach and lower back were sensitive to the touch and achy.  I was prescribed this two separate times in a  year and both times had this reaction. Both times the doctors stopped it's use and prescribed something else."