Metronidazole
"So I was given this for a UTI and my experience on this pill was absolutely horrible. I could only make it to the fourth day of my seven day dosage and I couldn't even make it. Not too sure why I was prescribed this in the first place, but this pill has made me feel TERRIBLE. Headaches, chest pain, anxiety, my heart beat is all over the place. I felt very weak and was having the feeling of shortness of breath. I stopped taking it last night and I am still having side effects from it, I hope they go away soon. Not only that but just knowing that this medication is known to cause cancer in labratory animals makes me feel nauseous in general. All around a terrible experience that gave me no relief at all what so ever."