Escitalopram
"I have been taking Lexapro for more than four years at 10mg-20mg.  It has been great at reducing mood swings, anxiety, and sadness. I have not noticed reduced effectiveness, however, my doc did move me up to 20mg because I was still experiencing pms mood swings and irritability.  I also have mild to severe depression.  There are only 3 side effects I have experienced and that is reduced libido, yawning, and inorgasmia. Which I feel I can handle as long as I'm happy and positive. I had tried Zoloft before and it didn't make me happier it just made me jittery and jumpy all the time and I couldn't relax.  So, Lexapro has definitely been the answer for me."