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Normal men have less than 12 mL of residual urine. The normal prostate size for an adult male is 15cc to 30cc (one half ounce to one ounce). Men whose prostate gland is larger than 30 cc are more likely to be diagnosed with enlarged hyperplasia. You should start to take an alpha-1-adrenergic antagonists. if you are not tolerate with it, you should take a 5-alpha-reductase inhibitor.