Nitrofurantoin
"I was prescribed Nitrofurantoin for a bladder infection.  My first day of taking this medicine my feet and hands became so very cold and I could not control the chills my hands became very pale it felt like frost bike like there were pins and needles in my fingers, I also became very lethargic and nauseated.  I also had very intense pain in my lower back.  I stopped taking them. I waited a few days and I took it at night before going to bed.  I wake up in the middle of the night with the same chills, numbness and tingling to my fingers and toes, nauseated and tired. This time I contacted my doctor and she advised me to stop taking the medication.  I won't take this medication ever again."