I am just writing a general response to what seemingly is the majority of comments: I too do not notice anything beneficial to taking my daily 5 mg tadalafil. My doctor also said it is to help with blood flow and healing. He did not mention anything about fibrosis/scarring prevention. Either way, I have not noticed anything sexually. I am 6-months post-RP and can't get an erection AT ALL. I have my 6-month follow up appointment next week and will ask my doctor "what the heck...when will I get and maintain an erection?" I am 70 years old and was quite capable of sustained erection and sex prior to the RP surgery. I am now divorced...God's cruel joke, just when I was looking forward to starting an active dating life and sex with some partner(s), I am dead in the water. I have not started dating as a result...it would be too humiliating to say: "um...ya...so...I have ED...I can't get an erection." One thing NONE of us really know either is whether our urologist "really" did "preserve the neurovasscular bundles" as read in our surgical pathology reports. Who the heck can ever "check on that" to prove it? The urologist could have accidentally damaged/severed the neurovasscular bundles and we'd never know. There is no test for it, other than whether we can get an erection or not, and I have heard that some men just never become capable of it after surgery even with the neurovasscular bundles supposedly preserved. Frustrating.