prevention of bladder infection
"I have had recurring uti's for 5 decades. I've been on macrobid for a couple of years. I've found it does help prevent the kidney and bladder infections with few side effects. 
The side effects I do have are: darkened urine, diarrhea occasionally, nausea and dry heaves occassionally, dizziness occasionally and peripheral neuropathy on occasion. 
Now I know you would think that these side effects would deter someone from taking this drug but for me those side effects are better than having bladder and kidney infections for 6 months at a time. For me the macrobid is the lesser of the two evils. Living with the infections is worse than these few issues."