I have a uti with lactose positive gram negative rods (a), and have had an allergic reaction to amox-clav in the past (but have taken amoxicillin in the past with no problem), I also have had allergic reaction to cephalexin starting the second day. I am worried about taking macrobid because of all the bad reviews I have read about people's reactions to it. Please help me to decide what to take for this uti.