As a man transitions from childhood to adulthood, testosterone spurs the growth of hair on the face, in the armpits, and around the genitals. A man with shrinking levels of testosterone actually may lose some body hair. Testosterone increases levels of growth hormone. Testosterone is one of many factors involved in the development of muscle bulk and strength. That makes exercise more likely to build muscle. This is because alpha-blockers relax the bladder and prostate muscle cells. Men who take alpha-blockers such as doxazosin (Cardura) and terazosin (Hytrin) may experience decreased ejaculation. ED medications and alpha-blockers both lower your blood pressure. Men who take these medications may also experience lower sperm count, decreased sperm volume, and lower sperm movement. This isn’t a common side effect of the surgery, but it does occur in 5 to 10 percent of men. Additionally, reduced sex drive is a possible side effect of the alpha reductase inhibitors dutasteride and finasteride.