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Most men 50 to 80 years old will have development of some degree of benign prostatic hyperplasia (BPH). Many who experience lower urinary tract symptoms (LUTS) will be treated medically. However, significant numbers will have more severe and progressive disease requiring surgery. Transurethral resection of the prostate is the current gold standard of treatment for BPH. Minimally invasive therapies for symptomatic BPH emerge and fade continuously. However, intraprostatic injection for BPH has been used for more than 100 years and may be on the verge of a rebirth. The goal of this review is to familiarize the reader with the origins and history of intraprostatic injection, and its evolution using transperineal, transrectal and transurethral routes with multiple injectants. Initially used to treat urinary retention in men with BPH, its primary indication is now for LUTS.

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