Aparently according to a couple of weirdos here don't like me answering questions because it offends them for some odd reason, but I'll do my best to answer yours.
But seriously.
Not on TRT, but something very similar.
I was diagnosed with Hypergonadism a year or so back after talking to my doc about a number of symptoms (lack of energy, low labido, etc) was sent for a blood test.
Test showed T levels too low (that's the Hypergonadism ... in my case), not an unusual thing, as you progress over the age of 40 T levels naturally drop.
I saw on YouTube on a Dr Rena Malik video that upwards of 50% of males will face this issue as they get older (can't remember the exact number sorry, so spitballing it a bit).
Anyway due to an extenuating circumstance I couldn't go on TRT, which would have been the first choice, I was placed on Clomiphene.
Clomiphene's primary uses are not for treating low T, but is used in a small number of cases like mine with successful results.
Was referred to the public health system's Endochronologist (that's a hormone doctor ... isn't it great we live in a country where everybody gets healthcare instead of just the rich) to monitor the situation going forward in partnership with my GP.
Roll forward a few weeks and I certainly felt like I had more energy.
And I remember a day early on where I felt like a teenager again, as there was a voracious sexual appetite, I suspect that was hormone levels ballancing, but that it i just a guess, and to a degree sadly was not a thing that stuck around.
Anyway, had a blood test a few months later which showed a marked improvement in T levels back to the range that it should be in.
That tracks as a number of other signs where there, including more strength at the gym, and better muscle tone due to doing some weight lifting (not going to turn you into Schwarzenegger in his prime, but it does help to have good T levels none the less).
I recently had a follow up consultation with the Endochronologist who ordered a second blood test to check T levels, which I have to get in a week or so (these tests must be done in the morning, preferably before 9am in order as that is when T is at its highest level), and all going well that will show T still in the right neighbourhood.
I don't know if there is a limit on how long TRT lasts, but in my case due to the treatment regime that I'm on it is generally 18 months, so I have about 6 months left to go at the end of this year.
Again I don't know if TRT is the same, but one of the most annoying side effects that I have had (really the only one) has been weight gain.
That was somewhat mitigated by the fact that I'd already been exercising in order to get my weight under 85kg, and I have been sitting in the sub-90kg range since starting treatment, but it can be a struggle sometimes as easing off the reigns even a little tends to have a not insignificant effect, at least in my case (And I lead a fairly active lifestyle).
For some context, I'll add the AI generated answer to what the difference between the two treatment types is (normally I take AI generated information with a grain of salt, but the following gels pretty well with what I recall my doc telling me):
TRT (testosterone replacement therapy) involves directly supplementing the body with testosterone from an external source, whereas Clomid (clomiphene) is an oral medication that stimulates the body to produce its own testosterone by blocking estrogen receptors. TRT provides a direct, potentially faster testosterone boost but can suppress ******* production and fertility. Clomid is often preferred for younger men or those desiring to preserve fertility, as it supports ******* testosterone production and sperm health.
I know that it wasn't exactly TRT, but it was for the same condition, so hopefully there was some useful thing in there for you.
If you have any questions, I'll be happy to answer most, assuming that I know the answer of course.