Hi and thank you so much for this query. I am so sorry to hear about his urinary difficulties. Cialis in never used for urinary difficulties. It is used for sexual impotence only. I would have also expected that he gets no relief taking cialis for urine floe difficulties. I will like that you ask his doctor what that was for just to get the facts clear. Yes, 2 capsules of flomax 5mg are the exact equivalence of a capsule of flomax 10mg. There is not need to gett worried about this. When the 5mg capsules are finished, please revert to buying the 10mg tablets for easy administration and a reduced cost. I hope you find this helpful. Thank you for using our services and please feel free to ask for more information if need be. I wish you the best of health. Dr. Ivo, MD.