I'm now on Fentanyl 100, I currently suffer sharp pains in stomic back of kidneys and top chest area, I'm waiting to see a specialist this December, my sex drive is all but gone, TO save a relationship, I'm wondering if it would be safe to try Viagra, especially with all my dramas, I tried to become sexual all day today to no avail, it felt I might get there then dropped away, I'm about to give up, I don't have the drive or need no more. Well any advice would be appreciated. Cheers. James K