I went to the ER monday because I was urinating a lot so I have a UTI they gave me antiniotics and another pill that turna my urine orange I've been having a burning sensation on the back of my thigh? I'm curious to know if its the meds?

Probably not. The pill that turn urine orange is called Pyridium (phenazopyridine) or Phenazopyridine which relieves urinary tract pain, burning, irritation, and discomfort, as well as urgent and frequent urination caused by urinary tract infections, surgery, injury, or examination procedures. However, it is not an antibiotic; it does not cure infections. Never seen this side effect listed.