Looking back on my own experience, as I take my own HRT, I actually have an initially high libido about a day after the injection (at the peak), then libido goes down. It returns to very high about the point that the half life of 7-10 days has passed, and if I still wait a bit longer to take the next shot, libido increases maybe a bit more. There's definitely a correlation between where estrogen and testosterone levels are in relation to each other. If I'm using Cialis during those particular times, I have no trouble with ED at all, but otherwise it's another story even with the Cialis.
I can totally relate to this. A couple of years ago I moved from one state to anothwr and was having a time finding a doc to continue prescribing TRT for me. The doc I was seeing finally relented but insisted I do it "his way", which meant 200 mg once every 2 weeks. This produced EXACTLY the effect you described. For a couple of days after the shot, strong libido, strong erections. Then it all shut off - completely - at least the erections, which generally kills my libido - then, towards the end of the 2 week period, libido and wrections would come back. I'd take my next shot and go through the cycle again.
When I switched docs to my current one, who is far more knowledgeable and far less rigid - though still very conservative with total T levels - I was doing 160/week in 1x per week injections. I wxperienced the same thing but on a shorter interval. By the end of the 1 week period erections were starting to come back. This is when I decided to try 2x per week injections. I reasoned that the 160/week was sending total test too high and I did 100 mg instead of 160, then followed this with a 60 mg shot 4 days later. This worked great. I bumped up the 2nd shot to 80 mg and found a sweet spot of 100/80.
Probalem is, that puts total test at around 1400, whichbthe doc doesn't like. He wants to see 850. So, twice now, I've backed off to 140/week (80/60) a month before my bloodwork and results pleased the doc. This just isn't enough for me. I can't get it up at that level. At all. Not even any interest. You know your test level isn't right when you're not interested in sex anf just don't give a shit.
Problem is, if I go straight back to the 100/80 it just doesn't seem to work! In the past, I've been able to get back to the sweet spot within a few weeks of fucking around with doses higher or lower, sneak up on the right amount. This time, I just can't seem to get it right! It's been since September and I've had maybe 2 successful erections in that time that didn't require viagra. Cialis doesn't work at all for me and gives me WICKED heartburn, apparently a fairly common side effect of all the vasodilator drugs; viagra usually works but also sometimes gives me heartburn.
I'm currently experimenting with much higher dosing and adding masteron. My normal dosing schedule is Fri 100 mg; Tues 80 mg test cyp. Starting last week I added 75 mg masteron prop EOD. This initially seemed to help but the either the first success was a fluke, or the positive effect faded - maybe I overshot the mark, I don't know. In any case, after 1 week and still no consistent success, I decided to try much higher test dose. I added 100 mg test prop EOD and I increased the mast to 100 mg. My reasoning with the test prop is that it - and any side effects like a wet noodle dick - should clear quickly. I seem to be moving in the right directuon but definitely not there yet. No night time erections yet. Just took my 2nd test/mast injection today (100/100). We'll see what happens.
So far, it seems like every time I've had bad ED from being "too high", good function has returned as I came back down. So, if this doesn't work, I am hoping that as the test prop clears and my levels fall, I'll land in the sweet spot again of 100/80 test cyp, which I am keeping up. So I'm right around 500 - 600 mg total test per week right now, higher than I've ever done before. Haven't had a chance to "try it out", so to speak, with my wife because of busy schedules, etc, as well as the mind fuck aspect on my end - basicall the fear that ot ain't gonna work, which will kill an erection like sticking a pun in a balloon. But, still no night time erections, so I do know I'm not yet "in the zone".
I took about a half mg of Adex with my Tuesday shot; none today, and probably going to keep it to 0.5 1x per week amd see how things go.
Not sure where I'm going from here if this eventually roves to work. I do NOT like the pin cushion effect of EOD - and with tomorrow's test cyp injection it's ED for these 3 days. But we'll see how it plays out.