i would certainly try the medication for at least a month if he is able to empty his bladder at this point. Unfortunately the potency of prostate medications and ability to decrease size (as opposed to decreasing further growth) is not so great. In that time though i would get a second opinion from another urologist. saw palmetto herbal helps as well. less invasive treatment options include laser or thermal treatment to shrink (this is obviously somewhat invasive but less so than TURP surgery). the effectiveness in severe cases is best with surgery though.