I have been taking Procardia (30 mg ER per day) for 15 years following a heart attack in 1988. I also take Persantine and Zocor. I am 67 years old and my blood pressure is very good - averaging 120 over 70. In early October of this year, I began EBRT (3D conformal and IMRT) for early stage prostate cancer. After several weeks now, I am having symptoms of urinary slow down and retention, especially at night. I get up about 5 times per night. My radiologist told me to expect this. We have started discussing use of Flomax temporarily to relieve these symptoms but he seems hesitant because he says the Flomax will lower my blood pressure somewhat. I understand that Flomax is an alpha-blocker. My question is how much risk do I run by using .4 mg of Flomax daily in light of the other medications I am using? I am in good health, exercise regularly, and am not overweight. Also, apart from my heart situation, are there any side effects to consider from using Flomax? Thank you.