How do you tell if finasteride is impacting your brain?

I am about to get on fin but the one thing holding me back is I’m scared of suffering mental sides. How do you even know if you are suffering from them and not just… well… dumber?!? Makes me nervous cause of other things in my life. Curious if any fin users can add to this from their experience. Thanks!

People who have mental side effects generally don’t feel right. This is rare.