Welcome to the forum!
The reply by Mike was a fairly good one.
I'm not a medical professional of any kind. Anything I post is based on my own experiences, at best and delusions or hallucinations, at worst. Internet forum advice is very likely worth what you pay for it, or worse. Always ask your doctor and follow his/her advice.
Wesbigs wrote:I have been using the pump for a couple of weeks but so far the only way to stay erect has been by using two tight bands which are uncomfortable at best.
The pump and medical grade constriction rings is not a fantastic solution but it can be made to work acceptably and does get better with practice.
Wesbigs wrote:I'm thinking about asking my urologist about injections when I see him next month but the whole thing seems odd to me and I have questions about them?
Ask anything and everything you can think of.
Wesbigs wrote:Do they feel like a normal erection? the pump doesn't feel normal at all.
They can feel pretty normal, especially after you get your dose perfected. Keep the pump around for at least therapy purposes. The pump method does get better with practice.
Wesbigs wrote:How much experimenting does it take to find a dose that actually works?
That can vary greatly from person to person. It might be on the first try or it make take an extended trial period. But I think the norm is pretty quickly. Also, it has been my experience and apparently the experience of some other guys that after some practice with injections you may find that you can use less juice, AKA a smaller dose.
Wesbigs wrote:Do you build a tolerance to the injections like you can with pills?
That seems to vary a lot and for different reasons. Some report developing a tolerance. Some report developing a tolerance that can be reset with a break from use. A fair number suffer from a venous leak that slowly worsens requiring stronger doses until the point is reached where it no longer works. Some guys report using injections for an extended time without issue or dose increase. I'm pretty much in this last category.
My ED was caused by prostate removal and is profound. Pills didn't do anything on their own although they did help when using the pump as they made pumping easier. I've been using injections for a number of years now and my dosage has remained pretty stable once getting past a learning curve. Unfortunately my Uro provided no instructions and I didn't find this forum during my time of need so there was a longer than necessary learning curve. I did not have a venous leak prior to prostate removal and happily haven't developed one. That probably explains why my dosage has remained stable. It seems to work as well now as it did in the beginning, if not better.
Wesbigs wrote:Are there side effects like the pills where you get the headache or stuffy head?
There can be side effects but not necessarily. There is risk of priapism (unwanted extended erection of 4 hours or more) which can cause tissue damage if untreated. Some men, a minority, can develop scaring and/or calcification from the needle prick or the medications themselves. This can cause peyronie's disease and deformation of the penis. Again, this is a minority but it is a risk to be aware of.
Some men using tri-mix react badly to one of the ingredients. The usual drug causing the issue is the alprostadil also known as prostaglandin E1 or PGE-1. It is also the most potent ingredient for causing an erection. It causes severe pain in some men making it's use impossible. It can also cause some pain in many other men to an acceptable or controllable degree. If I use too much I will get some pain. Initially, when I first began using it it caused more pain but in my case, and reportedly in many other cases, it moderates or disappears with continued use. It is my medication of choice as I just use a mono-mix containing only alprostadil and saline. I've never experienced any other side effects. I also use novelty sex shop cock rings that help me to minimize the amount of drug necessary.
Sorry for such a marathon response. I hope it helped.