I've been taking citalopram every day for like 5 years for my anxiety. So when I got Propecia, I took 0.25 mg before bed. Woke up in the morning, felt fine, took my 20 mg citalopram pill, then went to school. At school, I started feeling a little weird in the head, but it was tolerable. Night comes along, I take another 0.25 and go to bed. In the morning I take another citalopram pill and felt very off afterwards. Decided not take anymore Propecia after that. I felt dizzy/couldn't concentrate/clouded/heavy for over a month. It was really annoying. I just wanted to sleep so I could escape it.
Once my mental sides finally went away, I started getting these itchy, periodic, bee stinging sensations all over my body. It was constant. That lasted a few weeks, went away for a while, then came back again. I believe the Propecia may have damaged my neurons. Apparently that's a thing, although I've never heard of anyone else on the internet getting that as a side effect. I know it seems crazy because 0.25 mg is so little, but I'm not exaggerating. Maybe the citalopram and Propecia didn't mix well with my body, I don't know.
My dad's dad has good hair for his age. My dad has taken lots of steriods and crap, so it's hard to judge, but it's thinned...still OK. My mom's dad went bald. My mom's brothers all have some hair loss. My brothers (19 and 24) have better hairlines than me.