And there’s lots of work to do before it might become one. It's bound to work and for the most part is safe and effective. Each of the clinical trials currently in the works are fairly preliminary, in the first or second of three required phases of testing before a medication can be approved for a specific use. Here is more information in regards to generic viagra take a look at our own website. For now, PDE5 is not an approved cancer medication. The study summarizes 25 studies that suggest Viagra may help fight different types of cancer, such as breast, colorectal, lung, pancreatic, and others that are in dire need of new treatments.