Doctors use a variety of medications to treat prostate gland enlargement:

Alpha Blockers: Alpha blockers release the muscles at the neck of the bladder, allowing for easier urination. The four alpha blockers that have been approved by the U.S. Food and Drug Administration (FDA) are terazosin (Hytrin), doxazosin (Cardura), tamsulosin (Flomax) and alfuzosin (Uroxatral). Alpha blockers taken with drugs for impotence, such as sildenafil (Viagra), vardenafil (Levitra) and tadalafil (Cialis), may interact and cause low blood pressure.

Finasteride (Proscar, Propecia) and dutasteride (Avodart): These drugs actually shrink the prostate gland. However they are generally not effective in men who have only a moderately enlarged prostate. A small percentage of men who take finasteride experience impotence, decreased libido and reduced semen release during ejaculation. Finasteride also has been shown to adversely affect sexual function and to slightly raise the risk of developing higher grade prostate cancer.

Combination drug therapy; The combination of the alpha blocker doxazosin with finasteride appears to significantly reduce the risk of prostate gland enlargement. The combination treatment also significantly addresses urination problems associated with an enlarged prostate.