Nitrofurantoin
"This was the worst thing I've ever taken. Within 15 minutes I started to get a cough. I got sicker from then on. Two hrs after dose I had a constant cough, pain in my chest, a fever, tremors and chills, muscle weakness, and a massive headache. I had to use the restroom and could hardly get there. On the way back to bed my legs just gave out under me. It took 12 hrs before my legs and arms worked right, about 14hrs for fever and It took 24 for my headache to subside. My chest is still sore. If I take a deep breath I will cough. I would not recommend this drug. My pharmacist and Drs office said that it sounds like I'm getting the flu because this drug doesn't do that. Read the side effects. It does it all!"