Nitrofurantoin
"I've taken exactly 4 pills and I will not take one more ... no fever or chills but I have a rash all over my body. I have never been allergic to anything in my life and now this rash is horrible back legs arms stomach. It's itchy and just plain annoying! Also my urine had cleared up before taking these pills now it's back to a very dark color. I am not taking another pill , as for my UTI I will try some parsley tea  and see where that gets me"