I took lexapro for about a year, and found it very effective. It took effect within days, and I was a happy guy. The most significant side effect was the sexual dysfunction, which over time became intolerable. However the tolerable side-effects were nausea, insomnia, dry mouth, slight loss of appetite, persistent headaches, and some jitters.
Those effects were very distinct, and very cumbersome, but overall the med improved life dramatically. I had a sunny but reasoned perspective on my life and the world, and was upbeat. Sadly, the sexual dysfunction (and I always thought this was so ironic - cynical to think someone up there decides there is no such thing as a free lunch in life) was too much.
Good luck