The only difference between the two chemcially is this...
Think about your hands. They're exactly the same but also exact opposites, right? So your lefthand glove won't fit onto your right hand. Well Celexa's active molecule is just like your hands. Half of the molecules are shaped in one direction, and the other half in the other direction. Now picture all the receptors in your brain that it's supposed to bind up with as all left gloves. It's the extra right hands floating around in your system that causes some of the side effects of Celexa.
With Lexapro they took the active molecule in Celexa and got rid of the "right hands." So one, yes it's more potent. A lower dosage will do just as well as a higher dosage of Celexa. But there's also nothing left of the active molecule to cause side effects. There's still a risk of some, but much less than with Celexa.
They are both ssri's and I have been on both and I am currently on Lexapro which has worked well for me but every one is different. The max dose of Celexa is 60mg and Lexapro is 20mg, Lexapro is the strongest of all the ssri's.
Good luck and I hope which every you choose works well for you.
I try not to worry about the future -- so I take each day just one anxiety attack at a time.
Diagnosed with:- Asperger's Syndrome, dyslexia, gad, sad, ocd, depression, reactive arthritis
Medication:- 400mg Lyrica, 15mg Escitalopram, Serequel 25-50mg, 4mg Diazepam !000mg Naproxen