Hypothesis: Dutasteride will perform better than finasteride in decreasing prostate volume, improving symptoms based on International Prostate Symptom score,and lower pvr based on the scientific information that dutasteride inhibits both Type I and II 5-alpha-reducatase vs. finasteride which only inhibits the Type II enzyme

Inclusion Criteria:

• Male
• Age 50-80
• On finasteride for no less than 12 months
• Willing to undergo all necessary test in the 12 month evaluation

Exclusion Criteria:

• History of medication non-compliance
• Unwillingness to undergo/tolerate 2 blood draws
• Unwillingness to tolerate/undergo 2 TRUSP