Drug treatments are available. Finasteride (brand name: Proscar) makes the prostate shrink, but it does not help all patients. The side effects of finasteride are rare and mild, but they usually have to do with sexual function. They go away when the medicine is stopped. The prostate will enlarge again when the medicine is stopped, so another treatment may have to be tried.

Another kind of medicine, called alpha blockers, also can help the symptoms of BPH. Some of these drugs are terazosin (brand name: Hytrin), doxazosin (brand name: Cardura) and tamsulosin (brand name: Flomax). Alpha blockers have been used for a long time to treat high blood pressure, but they can also help the symptoms of BPH, even in men with normal blood pressure. These medicines may not work in all men. The side effects of alpha blockers are mild and go away if you stop taking the medicine. The side effects include dizziness, fatigue and lightheadedness.