The regimen works to various degrees for different men so it is best to have a long conversation with your medical provider. Much information from doctors is based on statistics so you will want information that is based on where you fall in the statistical norm or tails.
Per discussion on a number of forums, some men do not react to PDE5 inhibitors and some find that these have a limited lifetime of use. The experience with injections also varies.
You can find a number of studies on pubmed.gov as well as Prostate Cancer Research Institute videos.
By the way, Dr. Mulhall may have updated his information on the effects of radiation and ADT on sexual function, but what I've seen so far does not reflect my personal experience.
Guy B. Meredith, moderator
https://www.youtube.com/watch?v=V3lTOg3TOPI