E.r or Tylenol

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So I went to the hospital a month back and when I was in I caught a UTI that had spread to my bladder. So I had went in they gave my Tylenol and antibiotics but I ran out of my prescription and I need to go again because I'm feeling the pain still so idk if I should go buy more Tylenol on my own and take it or go to the doctor's for they can give it to me?