Macrobid
"I was given this medication for a Uti i was suffering from that just wouldn't go away with cranberry juice and otc pills. The first day after taking this my symptoms were almost gone. On day 1, my second pill which was at night made my stomach cramp so bad i almost curled over. But i continued with my prescribed dosage. On day 3 i felt almost completely cured of my uti. But on day 3 when i took my 2nd pill of the day which was before bed i started to feel stuffy and had shortness of breath, accompanied by blurred vision, That was very scary.  I will not be finishing the rest of the dosage of this medicine. I was prescribed 2 100mg pills every 12 hours for 7 days. Fingers crossed my symptoms dont come back. Beware of side effect!"