Nitrofurantoin
"I was prescribed this medicine for a bladder infection and would never recommend anyone to take it. Obviously it depends on your body type but I usually have a high tolerance. I'm needing to head to the doctors now because I've been experiencing painful headaches everyday, sharp stomach aches, muscle pain, chills (hot to brutally cold:fever type symptoms), tingling, light headed, nauseous, eye aches, my urine went from neon green to dark brown, and as gross as it is, I haven't been able to take a proper poo but every time I pass gas on the toilet watery diarrhea like stuff comes out and I've seen some blood when I whipped. This medicine definitely didn't go well with me and is a painful experience!"