3 years finasteride. Synchronized shedding?

[TUP2020]

Hi again!!

I am working to stop my general hair thinning. I seeing a low density at my scalp six months ago and i don´t know what could is happening. I rememb to read something about finasteride could generate a synchronized shedding after two or three years of continued use, and i want to know if it is possible it´s happening to me. I am taking finasteride three years ago.
I see "a lot" of small hairs at the hairline...but i have a general thinning at frontal and midscalp. The vertex is fine.

Anyone knows something about finasteride synchronized shedding?

Thank you!!