I Have A Very Sensitive Enlarged Prostate. I Had Shoulder

I have a very sensitive enlarged prostate. I had shoulder surgery six weeks ago and the anesthesia sent me to the ER 12 hours later with urinary retention. My dermatologist gave me Fluorouracil 5% topical solution to put on my face for three weeks for precancerous spots on my forehead and cheeks. I'm wondering if the Fluorouracil might cause urinary retention.