I read of many claiming gyno(breast enlargement), but this is closely realted to sexual sides.
Some people have claimed gaining wieght on propecia. IT's up to debate if propecia would actually have this effect. But, even ifit is a finasteride side effect, I would say it is fairly rare.
Loss of strength. Depends on the individual. If you lives a healthy life, and do lots of exercise, then you would never notice strength loss. I think(not positive) but don't weighlifters some times boost test with finasteride.
Effects on brain and nervous system have also been studied.
Some have said that finasteride actually caused hairloss to speed up(I personally don't totally dispess this, but I highly doubt it)
Good way to avoid prostate cancer possibly(f*cking bonus dude)