Saw my psychiatrist today and he was shocked that my GP had put me up to 20mg after just three weeks. He said lexapro is much more potent than the other ssri's so 10mg has the same effect as 20mg in other ssri's. He wasnt suprised that I felt dreadful. He's reduced me back to 10mg a day so Im relieved as I really felt dreadful. Was awake all last night, couldnt sleep.