Nitrofurantoin
"I am 66 yr. old and get a lot of UTI's after going on the bike, in the pool, and apparatus at the gym that causes friction in that area. I usually get ciproflaxcin, which doesn't affect me much. But, Macrobid, causes, stomach troubles, nausea, chest and lung problems, chills, fevers, dizziness, palpitations, headaches, and more. I didn't have time to say " no" to the walk in doc. who gave me this again, but, I will never, ever, use it again. I know it  going to take another week, to get " semi- normal" again, but, this med takes me down every time."