In my situation for example. I grow muscles on propecia, felt really really good but had sexual sides, not horny.
We know that propecia makes T jump up abit. about 20% but we also have ppl on this site who demonstrates a Testosterne reduction after quitting of alot more than the 20% increased during treatment. I cant recall who but remember reading some1 with 1000+ on propecia but dropped down to 300+ after disscontiued the drug.
If 300+ was his baseline b4 propecia then T jumped a whopping 200% or so. This is not very likely in my opinion.
I think some ppl just have sensitive system so when he started propecia his body tried to produce alot more T to compensate for the reduction in dht. Maybe from 600 to 1000 (guessing but u get the idea).
Now the body made be able to work in this overdrive state for awhile but after a while it cant keep up the jobb.
Meanwhile the liver is trying to up the 5ar enzyme to get the dht up, that dont work cause with fin in the system it just get bound up so the reduction in dht stays more or less the same.
At the same time aromatize is getting alot of new food in the Testosterone flood, so in time estradiol goes up and shbg follows accordingly.
Now when our body is finally saying its had enough the T lowers again and we start feeling sluggish and depressed, now t has prolly gone down some and the testicles may show it, as mine did. We realize we need to try and get off this shit cause we arent feeling to good. Lets say at this point T has dropped to 4-500 (guessing again).
Fin is slowly exiting our system and we feel that surge in dht / androgen and the body starts feeling okay, another week or 2 the exessive 5ar enzyme drains your now quite low Testosterone by converting to much of it to dht. Dht is also quite suppresive at the hypothalamus so the combination of the increased estrogen and now massive loads (demonstrated by lots of guys in here) of dht lowers T down to hypogonodal levels. We start feeling really bad now and as time goes by different symptoms start popping up. Some might even exp a crash.
For some progesterone kicks in to lower dht at the expense of weakend adrenals for some this dont happen. Either way the body is not working efficently and we are paying a dear price.
This is what i think happend to me. Can i prove it ? NO!
The flaw in this theory is that exessive dht is suppose to make you loose hair and this aint happning for many. What id like to know tho is, do we know that the benefits on hair from propecia is by reduced dht? or is it the actual increase in testosterone or estrogen? Grasping for straws ofc.