More and more men are coming in with complaints after taking finasteride.

I certainly have a number of patients that complain of low libido, erectile dysfunction—this post-finasteride syndrome… Some men do have resolution when they stop. But there is this permanence in some handful of men. They’ve done MRI imaging to try and understand, anatomically, what’s going on. There’s still a lot of unknowns about it.  It can be permanent in some men, so they come in and see me in clinic… I think the exact mechanism of what’s going on here, what’s changing—we need more understanding of the exact pathophysiology, more neurochemical understanding.