Does finasteride block dht or cause the body to produce less dht?

[philippe]

I have been on finasteride now for about a year, though I lowered my dosage to .05mg about 4 months ago when the sides were getting bad. Things have improved slightly since then. I have read that finasteride is only in the system for a matter of hours and in that time it blocks dht production. What I am curious about is why it takes a matter of months to see improvement from side effects were one to stop taking the drug? If it takes months this leads me to believe that not only does finasteride block dht when taken it also causes the body to produce less dht whilst on the drug. Am I correct in assuming this? Blocking dht and causing the body to produce less dht are two different things, are they not?