Forget the rest simply go with the injectable when it can be used.
Not sure I'd agree. Cialis was a great weekend pill for me (take it Friday evening, good to Sunday noon whenever the time is right). I used it when things didn't get as hard as I liked and as easily as I liked. Solved the problem.
But after my prostate surgeons ended all spontaneous erections, and none of the pills or Muse worked, I found that tri-mix did work well -- maybe too well. Had to reduce the dose.
I'd never use an injectable as first choice. If the tablets work, fine. No real danger. Only the injectables can get you into serious trouble: the often mentioned erection lasting more than 4 hours. The problem with one of these epic hard-on's is that, while it's hard, the penis actually has very little blood flow. The penis is full of blood, but little is going in and out. That's why the head can get purple looking with a serious hard on, or with a cock ring that's too tight. Not much oxygen getting in there. The tissues get oxygen starved after a few hours and real damage, perhaps not reversible, can happen. You need to go to an emergency room for treatment.
The injectables also avoid surgery, but can cause fibrosis at the injection site if you're a regular user. So a surgical implant might be a good idea for regular sex when the natural mechanism no longer provides.:smile: