Prostaglandin is a medication available by prescription that helps reduce the size of an enlarged prostate. The active ingredient in Prostadine is finasteride, which blocks type II 5-alpha reductase. Prostadine works to reduce dihydrotestosterone (DHT) levels, a hormone created during the subsequent processing of testosterone, hence preventing an enlarged prostate. The prostate gland becomes inflamed due to this ailment, which is called prostatitis. The prostate, a small, walnut-shaped gland that's part of the male reproductive system. located anterior to the rectus and sub-bladder. The fluid produced by the prostate gland makes up a portion of the sperm.