I am not the lung cancer patient here nor have I had chemo, just radiation. So I don't know if this info will really help. But I choose to share it. Because of my age, I have battled impotence off and on, but all I have been through with prostate cancer and heart surgery took its toll. Recently, I asked my urologist if there was any chance of counteracting the impotence. He recommended the new drug, Levitra, and gave my some samples to try. Well, it works for me! I can't believe it. I don't know if this is an option for any of the men who are going through lung cancer treatment, but it might be well to inquire. Cheers. Don