HCV,
If it were me I would have a discussion with the surgeon. In my case, I am on "daily for life" docusate calcium as a stool softener because I had serious colo-rectal surgery long before PCa. The PCa surgery and RT just made it all worse.
The key is that if I wait to take it until I need it, I will be making that decision in the ER. Talk to your surgeon. There may be a "maintenance" dose that will resolve your issues.