Nitrofurantoin
"Holy Hell this drugs sucks! I was prescribed pills 2x a day for 3 days.  My first was fine, but when I took the 2nd at night after I had eaten before bed that changed. Am I the only one who feels like they have something caught in their throat? Every time I drink or eat something I literally spit it up. Not puking its more regurgitating. Like I can't eat? I took 3rd pill thinking maybe I drank too much water and will try again. I could barely swallow pill and spit up food again! Then I started having tunnel vision and feeling clammy and nervous. I am also constipated so that's awesome. I went in to doctor and I am pretty sure he thinks I am crazy and mental. I stopped taking it, but I still can't eat and I am still a bit dizzy at times."