Hi. I am 73 year s old. I am suffering from erectile problem. Whenever I go to bed with my wife, I play with her. But initially there is some erection in my penis, which subsides within a minute or two. We donot have any psychological problem between us. Our health is normal, except my wife. She is suffering from arthritis. Kindly suggest me most effective medicine to cure this permanently. Also please advise me, how & how-long I should use it. Thanks, & with regards. C P Pandey.