Nitrofurantoin
"Had either a urinary infection or intestinal. New to macrobid, in one day after taking the medicine I ran a 104.7 fever, was nauseous and hurt all over. Ran a fever off and on till I got off the med and started cipro.  Began noticing fatigue, brain fog and constant headaches. 10 weeks later I've been diagnosed with hypoxmia and am starting night time oxygen therapy. Already have RA, Sjogrens and Sarcoidosis, didn't need this drug complicating my life. Macrobid should be taken off the market!!!"