I noticed embedded in a couple other topics under side effects, people mentioning varying degrees of depression and related them to their use of propecia.
I can say personally it seemed to have caused me to fall into serve depression for the entire 2.5 years or so I took it. I started taking propecia right before I closed down a business I had for 5 years and laid off 20 people. So I suspected that caused me to feel blue and soon after emersed myself in an online game to get away from life for a while. But soon I slid into a deep dark hole for a couple years noone could bring me out... I even wrote a suicide note a couple times, but couldn't go through with it although I continued to think about suicide daily. After 2 years (while still taking propecia) I quit the online game, thinking the 15 hours a day playing that didn't help depression much, but still it persisted. FINALLY I quit taking propecia due to other side effects like wrecking my sex life, causing bad pain in my testicles and the formation of a small tumor in my scrotum. 3 months later I felt like a million bucks. The sexual side effects mostly vanished and my depression had mostly subsided. After 6 months off the drug I felt so happy I can't even explain and was tackling the world again like 3 years prior (before I took them nasty little pills).
Sure I lost the hair gains I had made because it DID work for me on hair regrowth; but I can NEVER get them 3 years back I lost. If anyone else had similar side effects, please post; I wan't to know. I don't know why I never put 1 and 1 together because a few times I quit taking Propecia for a few weeks and I did feel slightly better each time I quit. At least for me it did seemed to be directly connected which sucks--especailly since it took me almost 3 years to figure out!