Questions about ED injections

First thing to understand is how to give yourself injections.  There are plenty of diagrams you can get off the Internet but your urologist or his CNP should explain in detail and showing you how.  In fact, you should receive an injection when you are there so the initial reaction to the medication can be judged.  Second, understand the different medications you can use and why some men use different ones.  Some are compounded but cost less then other branded ones.  Third, ask about the time length of the erection.  Most urologists will tell you from about 45 minutes to an hour.  In my case to get an erection firm enough my erection last about three hours.  When using injections sex has to be planned as you just do not get up and go somewhere right away.  Fourth, ask about the types of injectors.  There are the traditional syringes which I use but other men who have some fear of the needle use auto injectors.  Last, ask about how often you can inject.  My urologist told me three times a week which seems to be typical.  There are the conditions of priapism and Peyronies you need to understand.

Tamu   

Most docs have a set formula to start off with for the initial try, and then adjust from there.  No matter what happens the first time, make sure you discuss the use of Trimix and Bimix with your doc, and see if you can come away with a prescription for one or both.  The Trimix costs $94, including cold pack shipping, and Bimix costs $57 for a 5 ml. bottle.  You know the standard formulas for them, don't you?  Bimix is 30mg papaverine/1mg phentolmine per ml, Trimix is the same with the addition of either 10mcg or 20mcg of alprostadil.  The average dose of Trimix seems to be around .08 to .1ml and Bimix .2ml to .4ml.(that's .1ml to 10 units on an insulin syringe.)   There's some special techniques for guys whose veinous valve function hasn't recovered yet, if you need to know them, just ask. I think I may have shared it with you earlier. 

Compounding Pharmacies:  https://www.healingwell.com/community/default.aspx?f=35&m=1017774

As far as your sensation question, I understand what you are saying.  During foreplay or just cuddling, the feeling of stimulation from the brain to penis that we all are familiar with (at least I am), is missing for me.  I can feel that naughty little twinge down deep in the gut, but it goes nowhere beyond.  Where before It resulted in running out the penis and triggering an erection, that doesn't happen now.  Because of that, my erections are created by the pump or injections.  The feeling stays in the gut, but that missing whatever little space in the nerves don't allow it to continue, sadly.  As a consequence, the more familiar surface stimulation of the penis is missing, and requires a redirecting of the brain from the accustomed surface reaction to more an inner feeling.  A light finger caress across the penis head ain 't what it used to be, as you have found out.  However, as you continue and with more practice you will find your brain 'resetting' what is pleasurable to you and the sensation and intensity should continue to improve.  It just takes time, training and work to accomplish it.  Don't give up.  In case no one has told you, this is the time to cast off inhabitions and embark on an intense period of sexual stimulation, either with your partner or by yourself.  Yes, I'm speaking of lots of foreplay to you, and-yes-musterbation.  Hand, vibrator, whatever.  You got permission, as therepy, to do it as often as possible. The more sexual stimulation you can apply to your penis, will be transfered to your brain in retraining the feelings you need to have a full and satifactory sex life.  That's ben the experience of lots of guys here.   Try it...

Here's what most of us have found out about MUSE. I tried it with the strongest dose, it didn't do a thing for me, except to give me the dull aching pain. MY urologist said that he rarely prescribes it anymore as his patients haven't had much success. I tried all 3 ED drugs with MUSE, same result every time.

You are one of the extremely lucky guys that it works for. A lot of us are pretty envious, except for the cost factor.  I did read somewhere that it only works for about 31% of the patients that try it.